Provided by: screen_4.8.0-1ubuntu0.1_amd64 bug

NAME

       screen - screen manager with VT100/ANSI terminal emulation

SYNOPSIS

       screen [ -options ] [ cmd [ args ] ]
       screen -r [[pid.]tty[.host]]
       screen -r sessionowner/[[pid.]tty[.host]]

DESCRIPTION

       Screen  is  a  full-screen  window manager that multiplexes a physical terminal between several processes
       (typically interactive shells).  Each virtual terminal provides the functions of  a  DEC  VT100  terminal
       and,  in  addition,  several  control  functions  from  the  ISO  6429 (ECMA 48, ANSI X3.64) and ISO 2022
       standards (e.g. insert/delete line and support for multiple  character  sets).   There  is  a  scrollback
       history  buffer  for each virtual terminal and a copy-and-paste mechanism that allows moving text regions
       between windows.

       When screen is called, it creates a single window with a shell in it (or the specified command) and  then
       gets  out  of your way so that you can use the program as you normally would.  Then, at any time, you can
       create new (full-screen) windows with other programs in  them  (including  more  shells),  kill  existing
       windows,  view  a  list  of windows, turn output logging on and off, copy-and-paste text between windows,
       view the scrollback history, switch between windows in whatever manner you wish,  etc.  All  windows  run
       their  programs  completely  independent  of  each  other.  Programs continue to run when their window is
       currently not visible and even when the whole screen session is detached from the user's terminal.   When
       a program terminates, screen (per default) kills the window that contained it.  If this window was in the
       foreground, the display switches to the previous window; if none are left, screen exits.  Shells  usually
       distinguish  between  running  as  login-shell or sub-shell.  Screen runs them as sub-shells, unless told
       otherwise (See "shell" .screenrc command).

       Everything you type is sent to the program running in the current window.  The only exception to this  is
       the  one  keystroke  that  is used to initiate a command to the window manager.  By default, each command
       begins with a control-a (abbreviated C-a from now on), and is  followed  by  one  other  keystroke.   The
       command  character  and all the key bindings can be fully customized to be anything you like, though they
       are always two characters in length.

       Screen does not understand the prefix "C-" to mean control, although this notation is used in this manual
       for  readability.   Please use the caret notation ("^A" instead of "C-a") as arguments to e.g. the escape
       command or the -e option.  Screen will also print out control characters in caret notation.

       The standard way to create a new window is to type "C-a c".  This creates a new window  running  a  shell
       and  switches  to  that window immediately, regardless of the state of the process running in the current
       window.  Similarly, you can create a new window with a custom command in it by first binding the  command
       to  a  keystroke  (in your .screenrc file or at the "C-a :" command line) and then using it just like the
       "C-a c" command.  In addition, new windows can be created by running a command like:

              screen emacs prog.c

       from a shell prompt within a previously created window.  This will not run another copy  of  screen,  but
       will  instead  supply  the  command  name  and its arguments to the window manager (specified in the $STY
       environment variable) who will use it to create the new window.  The above example would start the  emacs
       editor  (editing prog.c) and switch to its window. - Note that you cannot transport environment variables
       from the invoking shell to the application (emacs in this case), because it is  forked  from  the  parent
       screen process, not from the invoking shell.

       If "/run/utmp" is writable by screen, an appropriate record will be written to this file for each window,
       and removed when the window is terminated.  This is useful for working with "talk", "script", "shutdown",
       "rsend",  "sccs"  and  other similar programs that use the utmp file to determine who you are. As long as
       screen is active on your terminal, the terminal's own record is removed from the utmp file. See also "C-a
       L".

GETTING STARTED

       Before  you  begin to use screen you'll need to make sure you have correctly selected your terminal type,
       just as you would for any other termcap/terminfo program.  (You can do this by using tset for example.)

       If you're impatient and want to get started without doing a lot more reading, you  should  remember  this
       one  command:  "C-a ?".  Typing these two characters will display a list of the available screen commands
       and their bindings. Each keystroke is discussed in the section "DEFAULT KEY BINDINGS". The manual section
       "CUSTOMIZATION" deals with the contents of your .screenrc.

       If your terminal is a "true" auto-margin terminal (it doesn't allow the last position on the screen to be
       updated without scrolling the screen) consider using a  version  of  your  terminal's  termcap  that  has
       automatic  margins  turned  off.  This  will  ensure  an accurate and optimal update of the screen in all
       circumstances. Most terminals nowadays have "magic" margins (automatic margins plus usable last  column).
       This  is the VT100 style type and perfectly suited for screen.  If all you've got is a "true" auto-margin
       terminal screen will be content to use it, but updating a character put into the  last  position  on  the
       screen  may  not  be  possible until the screen scrolls or the character is moved into a safe position in
       some other way. This delay can be shortened by using a terminal with insert-character capability.

COMMAND-LINE OPTIONS

       Screen has the following command-line options:

       -a   include all capabilities (with some minor exceptions) in each window's termcap, even if screen  must
            redraw parts of the display in order to implement a function.

       -A   Adapt  the  sizes  of  all windows to the size of the current terminal.  By default, screen tries to
            restore its old window sizes  when  attaching  to  resizable  terminals  (those  with  "WS"  in  its
            description, e.g. suncmd or some xterm).

       -c file
            override the default configuration file from "$HOME/.screenrc" to file.

       -d|-D [pid.tty.host]
            does  not start screen, but detaches the elsewhere running screen session. It has the same effect as
            typing "C-a d" from screen's controlling terminal. -D is the equivalent to the power detach key.  If
            no  session  can  be  detached,  this  option  is ignored. In combination with the -r/-R option more
            powerful effects can be achieved:

       -d -r   Reattach a session and if necessary detach it first.

       -d -R   Reattach a session and if necessary detach or even create it first.

       -d -RR  Reattach a session and if necessary detach or create it. Use the first session if more  than  one
               session is available.

       -D -r   Reattach a session. If necessary detach and logout remotely first.

       -D -R   Attach  here  and now. In detail this means: If a session is running, then reattach. If necessary
               detach and logout remotely first.  If it was not running create it and notify the user.  This  is
               the author's favorite.

       -D -RR  Attach here and now. Whatever that means, just do it.

            Note: It is always a good idea to check the status of your sessions by means of "screen -list".

       -e xy
            specifies  the command character to be x and the character generating a literal command character to
            y (when typed after the command character).  The default is "C-a" and `a', which can be specified as
            "-e^Aa".   When  creating  a  screen  session,  this option sets the default command character. In a
            multiuser session all users added will start off with this command character. But when attaching  to
            an  already  running  session, this option changes only the command character of the attaching user.
            This option is equivalent to either the commands "defescape" or "escape" respectively.

       -f, -fn, and -fa
            turns flow-control on, off, or "automatic switching mode".  This can also  be  defined  through  the
            "defflow" .screenrc command.

       -h num
            Specifies the history scrollback buffer to be num lines high.

       -i   will cause the interrupt key (usually C-c) to interrupt the display immediately when flow-control is
            on.  See the "defflow" .screenrc command for details.  The use of this option is discouraged.

       -l and -ln
            turns login mode on or off  (for  /run/utmp  updating).   This  can  also  be  defined  through  the
            "deflogin" .screenrc command.

       -ls [match]
       -list [match]
            does not start screen, but prints a list of pid.tty.host strings and creation timestamps identifying
            your screen sessions.  Sessions marked `detached' can be resumed  with  "screen  -r".  Those  marked
            `attached' are running and have a controlling terminal. If the session runs in multiuser mode, it is
            marked `multi'. Sessions marked as `unreachable' either live on a different host or are `dead'.   An
            unreachable  session is considered dead, when its name matches either the name of the local host, or
            the specified parameter, if any.  See the -r flag  for  a  description  how  to  construct  matches.
            Sessions  marked  as `dead' should be thoroughly checked and removed.  Ask your system administrator
            if you are not sure. Remove sessions with the -wipe option.

       -L   tells screen to turn on automatic output logging for the windows.

       -Logfile file
            By default logfile name is "screenlog.0". You can set new logfile name with the "-Logfile" option.

       -m   causes screen to ignore the $STY environment variable. With "screen -m" creation of a new session is
            enforced,  regardless  whether screen is called from within another screen session or not. This flag
            has a special meaning in connection with the `-d' option:

       -d -m   Start screen in "detached" mode. This creates a new session but doesn't attach  to  it.  This  is
               useful for system startup scripts.

       -D -m   This  also starts screen in "detached" mode, but doesn't fork a new process. The command exits if
               the session terminates.

       -O   selects an optimal output mode for your terminal rather than  true  VT100  emulation  (only  affects
            auto-margin terminals without `LP').  This can also be set in your .screenrc by specifying `OP' in a
            "termcap" command.

       -p number_or_name|-|=|+
            Preselect a window. This is useful when you want to reattach to a specific window  or  you  want  to
            send  a  command  via  the  "-X"  option  to a specific window. As with screen's select command, "-"
            selects the blank window. As a special case for reattach, "=" brings up the windowlist on the  blank
            window,  while  a  "+"  will  create a new window. The command will not be executed if the specified
            window could not be found.

       -q   Suppress printing of error messages. In combination with "-ls" the  exit  value  is  as  follows:  9
            indicates  a  directory  without  sessions. 10 indicates a directory with running but not attachable
            sessions. 11 (or more) indicates 1 (or more) usable sessions.  In combination  with  "-r"  the  exit
            value  is  as  follows: 10 indicates that there is no session to resume. 12 (or more) indicates that
            there are 2 (or more) sessions to resume and you should specify which one to choose.  In  all  other
            cases "-q" has no effect.

       -Q   Some  commands  now  can be queried from a remote session using this flag, e.g. "screen -Q windows".
            The commands will send the response to the stdout of the querying process. If there was an error  in
            the command, then the querying process will exit with a non-zero status.

            The commands that can be queried now are:
             echo
             info
             lastmsg
             number
             select
             time
             title
             windows

       -r [pid.tty.host]
       -r sessionowner/[pid.tty.host]
            resumes  a  detached  screen  session.   No  other  options  (except combinations with -d/-D) may be
            specified, though an optional prefix of [pid.]tty.host may be needed to distinguish between multiple
            detached screen sessions.  The second form is used to connect to another user's screen session which
            runs in multiuser mode. This indicates that screen  should  look  for  sessions  in  another  user's
            directory. This requires setuid-root.

       -R   resumes  screen  only  when  it's  unambiguous  which one to attach, usually when only one screen is
            detached. Otherwise lists available sessions.  -RR attempts to resume  the  youngest  (in  terms  of
            creation  time) detached screen session it finds.  If successful, all other command-line options are
            ignored.  If no detached session exists, starts a new session using the specified options,  just  as
            if  -R  had  not  been  specified.  The  option  is set by default if screen is run as a login-shell
            (actually screen uses "-xRR" in that case).  For combinations  with  the  -d/-D  option  see  there.
            Note: Time-based session selection is a Debian addition.

       -s program
            sets  the  default  shell to the program specified, instead of the value in the environment variable
            $SHELL (or "/bin/sh" if not defined).  This can  also  be  defined  through  the  "shell"  .screenrc
            command.  See also there.

       -S sessionname
            When  creating  a new session, this option can be used to specify a meaningful name for the session.
            This name identifies the session for "screen -list" and "screen  -r"  actions.  It  substitutes  the
            default [tty.host] suffix.

       -t name
            sets  the  title  (a.k.a.)  for  the  default shell or specified program.  See also the "shelltitle"
            .screenrc command.

       -T term
            Set the $TERM environment variable using the specified term as opposed to  the  default  setting  of
            screen.

       -U   Run  screen  in  UTF-8 mode. This option tells screen that your terminal sends and understands UTF-8
            encoded characters. It also sets the default encoding for new windows to `utf8'.

       -v   Print version number.

       -wipe [match]
            does the same as "screen -ls", but removes destroyed sessions instead of marking them as `dead'.  An
            unreachable  session is considered dead, when its name matches either the name of the local host, or
            the explicitly given parameter, if any.  See the -r flag for a description how to construct matches.

       -x   Attach to a not detached screen session. (Multi display mode).  Screen refuses to attach from within
            itself.  But when cascading multiple screens, loops are not detected; take care.

       -X   Send  the  specified  command  to a running screen session. You may use the -S option to specify the
            screen session if you have several screen sessions running. You can use the -d or -r option to  tell
            screen to look only for attached or detached screen sessions. Note that this command doesn't work if
            the session is password protected.

       -4   Resolve hostnames only to IPv4 addresses.

       -6   Resolve hostnames only to IPv6 addresses.

DEFAULT KEY BINDINGS

       As mentioned, each screen command consists of  a  "C-a"  followed  by  one  other  character.   For  your
       convenience,  all commands that are bound to lower-case letters are also bound to their control character
       counterparts (with the exception of "C-a a"; see below), thus, "C-a c" as well as "C-a C-c" can  be  used
       to create a window. See section "CUSTOMIZATION" for a description of the command.

       The  following table shows the default key bindings. The trailing commas in boxes with multiple keystroke
       entries are separators, not part of the bindings.

       ──────────────────────────────────────────────────────────────────
       C-a '              (select)          Prompt for a window name  or
                                            number to switch to.
       ──────────────────────────────────────────────────────────────────
       C-a "              (windowlist -b)   Present   a   list   of  all
                                            windows for selection.
       ──────────────────────────────────────────────────────────────────
       C-a digit          (select 0-9)      Switch to window number 0  -
                                            9
       ──────────────────────────────────────────────────────────────────
       C-a -              (select -)        Switch  to window number 0 -
                                            9, or to the blank window.
       ──────────────────────────────────────────────────────────────────
       C-a tab            (focus)           Switch the  input  focus  to
                                            the  next  region.  See also
                                            split, remove, only.
       ──────────────────────────────────────────────────────────────────
       C-a C-a            (other)           Toggle   to    the    window
                                            displayed  previously.  Note
                                            that this  binding  defaults
                                            to   the  command  character
                                            typed     twice,      unless
                                            overridden.   For  instance,
                                            if  you   use   the   option
                                            "-e]x", this command becomes
                                            "]]".
       ──────────────────────────────────────────────────────────────────
       C-a a              (meta)            Send the  command  character
                                            (C-a)  to window. See escape
                                            command.
       ──────────────────────────────────────────────────────────────────
       C-a A              (title)           Allow the user  to  enter  a
                                            name for the current window.
       ──────────────────────────────────────────────────────────────────
       C-a b,             (break)           Send a break to window.
       C-a C-b
       ──────────────────────────────────────────────────────────────────
       C-a B              (pow_break)       Reopen the terminal line and
                                            send a break.
       ──────────────────────────────────────────────────────────────────
       C-a c,             (screen)          Create a new window  with  a
       C-a C-c                              shell  and  switch  to  that
                                            window.
       ──────────────────────────────────────────────────────────────────
       C-a C              (clear)           Clear the screen.
       ──────────────────────────────────────────────────────────────────
       C-a d,             (detach)          Detach  screen   from   this
       C-a C-d                              terminal.
       ──────────────────────────────────────────────────────────────────
       C-a D D            (pow_detach)      Detach and logout.
       ──────────────────────────────────────────────────────────────────
       C-a f,             (flow)            Toggle flow on, off or auto.
       C-a C-f
       ──────────────────────────────────────────────────────────────────
       C-a F              (fit)             Resize  the  window  to  the
                                            current region size.
       ──────────────────────────────────────────────────────────────────
       C-a C-g            (vbell)           Toggles screen's visual bell
                                            mode.
       ──────────────────────────────────────────────────────────────────

       C-a h              (hardcopy)        Write   a  hardcopy  of  the
                                            current window to  the  file
                                            "hardcopy.n".
       ──────────────────────────────────────────────────────────────────
       C-a H              (log)             Begins/ends  logging  of the
                                            current window to  the  file
                                            "screenlog.n".
       ──────────────────────────────────────────────────────────────────
       C-a i,             (info)            Show info about this window.
       C-a C-i
       ──────────────────────────────────────────────────────────────────
       C-a k,             (kill)            Destroy current window.
       C-a C-k
       ──────────────────────────────────────────────────────────────────
       C-a l,             (redisplay)       Fully     refresh    current
       C-a C-l                              window.
       ──────────────────────────────────────────────────────────────────
       C-a L              (login)           Toggle  this  windows  login
                                            slot.   Available   only  if
                                            screen  is   configured   to
                                            update the utmp database.
       ──────────────────────────────────────────────────────────────────
       C-a m,             (lastmsg)         Repeat   the   last  message
       C-a C-m                              displayed  in  the   message
                                            line.
       ──────────────────────────────────────────────────────────────────
       C-a M              (monitor)         Toggles  monitoring  of  the
                                            current window.
       ──────────────────────────────────────────────────────────────────
       C-a space,         (next)            Switch to the next window.
       C-a n,
       C-a C-n
       ──────────────────────────────────────────────────────────────────
       C-a N              (number)          Show the number (and  title)
                                            of the current window.
       ──────────────────────────────────────────────────────────────────
       C-a backspace,     (prev)            Switch   to   the   previous
       C-a C-h,                             window (opposite of C-a n).
       C-a p,
       C-a C-p
       ──────────────────────────────────────────────────────────────────
       C-a q,             (xon)             Send  a  control-q  to   the
       C-a C-q                              current window.
       ──────────────────────────────────────────────────────────────────
       C-a Q              (only)            Delete  all  regions but the
                                            current   one.    See   also
                                            split, remove, focus.
       ──────────────────────────────────────────────────────────────────
       C-a r,             (wrap)            Toggle  the current window's
       C-a C-r                              line-wrap setting (turn  the
                                            current  window's  automatic
                                            margins on and off).
       ──────────────────────────────────────────────────────────────────
       C-a s,             (xoff)            Send  a  control-s  to   the
       C-a C-s;                             current window.
       ──────────────────────────────────────────────────────────────────
       C-a S              (split)           Split   the  current  region
                                            horizontally  into  two  new
                                            ones.     See   also   only,
                                            remove, focus.
       ──────────────────────────────────────────────────────────────────
       C-a t,             (time)            Show system information.
       C-a C-t
       ──────────────────────────────────────────────────────────────────

       C-a v              (version)         Display  the   version   and
                                            compilation date.
       ──────────────────────────────────────────────────────────────────
       C-a C-v            (digraph)         Enter digraph.
       C-a w,             (windows)         Show a list of window.
       C-a C-w
       ──────────────────────────────────────────────────────────────────
       C-a W              (width)           Toggle 80/132 columns.
       ──────────────────────────────────────────────────────────────────
       C-a x or C-a C-x   (lockscreen)      Lock this terminal.
       ──────────────────────────────────────────────────────────────────
       C-a X              (remove)          Kill   the  current  region.
                                            See also split, only, focus.
       ──────────────────────────────────────────────────────────────────
       C-a z,             (suspend)         Suspend screen.  Your system
       C-a C-z                              must  support BSD-style job-
                                            control.
       ──────────────────────────────────────────────────────────────────
       C-a Z              (reset)           Reset the  virtual  terminal
                                            to its "power-on" values.
       ──────────────────────────────────────────────────────────────────
       C-a .              (dumptermcap)     Write out a ".termcap" file.
       ──────────────────────────────────────────────────────────────────
       C-a ?              (help)            Show key bindings.
       ──────────────────────────────────────────────────────────────────
       C-a \              (quit)            Kill    all    windows   and
                                            terminate screen.
       ──────────────────────────────────────────────────────────────────
       C-a :              (colon)           Enter command line mode.
       ──────────────────────────────────────────────────────────────────
       C-a [,             (copy)            Enter copy/scrollback mode.
       C-a C-[,
       C-a esc
       ──────────────────────────────────────────────────────────────────
       C-a C-],           (paste .)         Write the  contents  of  the
       C-a ]                                paste  buffer  to  the stdin
                                            queue of the current window.
       ──────────────────────────────────────────────────────────────────
       C-a {,             (history)         Copy and  paste  a  previous
       C-a }                                (command) line.
       ──────────────────────────────────────────────────────────────────
       C-a >              (writebuf)        Write   paste  buffer  to  a
                                            file.
       ──────────────────────────────────────────────────────────────────
       C-a <              (readbuf)         Reads  the   screen-exchange
                                            file into the paste buffer.
       ──────────────────────────────────────────────────────────────────
       C-a =              (removebuf)       Removes the file used by C-a
                                            < and C-a >.
       ──────────────────────────────────────────────────────────────────
       C-a ,              (license)         Shows  where  screen   comes
                                            from,  where  it went to and
                                            why you can use it.
       ──────────────────────────────────────────────────────────────────
       C-a _              (silence)         Start/stop  monitoring   the
                                            current      window      for
                                            inactivity.
       ──────────────────────────────────────────────────────────────────
       C-a |              (split -v)        Split  the  current   region
                                            vertically   into   two  new
                                            ones.
       ──────────────────────────────────────────────────────────────────
       C-a *              (displays)        Show  a   listing   of   all
                                            currently attached displays.
       ──────────────────────────────────────────────────────────────────

CUSTOMIZATION

       The  "socket  directory"  defaults  either  to  $HOME/.screen  or simply to /tmp/screens or preferably to
       /run/screen chosen at compile-time. If screen is installed setuid-root,  then  the  administrator  should
       compile screen with an adequate (not NFS mounted) socket directory. If screen is not running setuid-root,
       the user can specify any mode 700 directory in the environment variable $SCREENDIR.

       When screen  is  invoked,  it  executes  initialization  commands  from  the  files  "/etc/screenrc"  and
       ".screenrc" in the user's home directory. These are the "programmer's defaults" that can be overridden in
       the following  ways:  for  the  global  screenrc  file  screen  searches  for  the  environment  variable
       $SYSSCREENRC  (this override feature may be disabled at compile-time). The user specific screenrc file is
       searched in $SCREENRC, then $HOME/.screenrc.  The command line option -c takes precedence over the  above
       user screenrc files.

       Commands  in  these files are used to set options, bind functions to keys, and to automatically establish
       one or more windows at the beginning of your screen session.  Commands are  listed  one  per  line,  with
       empty  lines being ignored.  A command's arguments are separated by tabs or spaces, and may be surrounded
       by single or double quotes.  A `#' turns the  rest  of  the  line  into  a  comment,  except  in  quotes.
       Unintelligible  lines  are  warned  about  and  ignored.   Commands may contain references to environment
       variables. The syntax is the shell-like "$VAR " or "${VAR}". Note that this causes  incompatibility  with
       previous  screen  versions,  as  now  the  '$'-character  has  to  be  protected  with '\' if no variable
       substitution shall be performed. A string in single-quotes is also protected from variable substitution.

       Two configuration files are shipped  as  examples  with  your  screen  distribution:  "etc/screenrc"  and
       "etc/etcscreenrc". They contain a number of useful examples for various commands.

       Customization  can  also  be  done  'on-line'. To enter the command mode type `C-a :'. Note that commands
       starting with "def" change default values, while others change current settings.

       The following commands are available:

       acladd usernames [crypted-pw]

       addacl usernames

       Enable users to fully access this screen session. Usernames can be one user or a comma separated list  of
       users.  This  command  enables  to  attach  to  the screen session and performs the equivalent of `aclchg
       usernames +rwx "#?"'.  executed. To add a user with restricted access, use the  `aclchg'  command  below.
       If  an  optional  second  parameter  is  supplied, it should be a crypted password for the named user(s).
       `Addacl' is a synonym to `acladd'.  Multi user mode only.

       aclchg usernames permbits list

       chacl usernames permbits list

       Change permissions for a comma separated list of users. Permission bits are represented as `r',  `w'  and
       `x'.  Prefixing  `+' grants the permission, `-' removes it. The third parameter is a comma separated list
       of commands and/or windows (specified either by number or title). The special  list  `#'  refers  to  all
       windows, `?' to all commands. if usernames consists of a single `*', all known users are affected.

       A command can be executed when the user has the `x' bit for it.  The user can type input to a window when
       he has its `w' bit set and no other user obtains a writelock for this window.  Other bits  are  currently
       ignored.   To  withdraw  the writelock from another user in window 2: `aclchg username -w+w 2'.  To allow
       read-only access to the session: `aclchg username -w "#"'. As soon as a user's name is known to screen he
       can  attach  to the session and (per default) has full permissions for all command and windows. Execution
       permission for the acl commands, `at' and others should also be removed or the user may be able to regain
       write  permission.   Rights  of  the  special  username  nobody cannot be changed (see the "su" command).
       `Chacl' is a synonym to `aclchg'.  Multi user mode only.

       acldel username

       Remove a user from screen's access control list. If currently  attached,  all  the  user's  displays  are
       detached from the session. He cannot attach again.  Multi user mode only.

       aclgrp username [groupname]

       Creates  groups  of  users  that share common access rights. The name of the group is the username of the
       group leader. Each member of the group inherits the permissions that are granted  to  the  group  leader.
       That  means,  if  a  user  fails  an access check, another check is made for the group leader.  A user is
       removed from all groups the special value "none" is used for  groupname.   If  the  second  parameter  is
       omitted all groups the user is in are listed.

       aclumask [[ users ] +bits | [ users ] -bits... ]

       umask [[ users ] +bits | [ users ] -bits... ]

       This  specifies the access other users have to windows that will be created by the caller of the command.
       Users may be no, one or a comma separated list of known usernames. If no users are specified, a  list  of
       all  currently  known  users  is assumed.  Bits is any combination of access control bits allowed defined
       with the "aclchg" command. The special username "?" predefines the access that not yet known  users  will
       be  granted  to any window initially.  The special username "??" predefines the access that not yet known
       users are granted to any command.  Rights of the special username nobody cannot be changed (see the  "su"
       command).  `Umask' is a synonym to `aclumask'.

       activity message

       When  any  activity occurs in a background window that is being monitored, screen displays a notification
       in the message line.  The notification message can be re-defined by  means  of  the  "activity"  command.
       Each occurrence of `%' in message is replaced by the number of the window in which activity has occurred,
       and each occurrence of `^G' is replaced by the definition for bell in your termcap  (usually  an  audible
       bell).  The default message is

                       'Activity in window %n'

       Note  that  monitoring  is  off  for  all  windows by default, but can be altered by use of the "monitor"
       command (C-a M).

       allpartial on|off

       If set to on, only the current cursor line is refreshed on window change.  This affects all  windows  and
       is  useful  for  slow  terminal  lines.  The  previous setting of full/partial refresh for each window is
       restored with "allpartial off".  This is a global flag that  immediately  takes  effect  on  all  windows
       overriding  the  "partial"  settings.  It  does  not  change the default redraw behavior of newly created
       windows.

       altscreen on|off

       If set to on, "alternate screen" support is enabled in virtual terminals, just like  in  xterm.   Initial
       setting is `off'.

       at [identifier][#|*|%] command [args ... ]

       Execute a command at other displays or windows as if it had been entered there.  "At" changes the context
       (the `current window' or `current display' setting) of the command. If the first  parameter  describes  a
       non-unique  context,  the  command will be executed multiple times. If the first parameter is of the form
       `identifier*' then identifier is matched against user names.  The  command  is  executed  once  for  each
       display  of  the  selected  user(s).  If  the  first parameter is of the form `identifier%' identifier is
       matched against displays. Displays are named after the ttys they attach. The prefix `/dev/' or `/dev/tty'
       may  be  omitted  from the identifier.  If identifier has a `#' or nothing appended it is matched against
       window numbers and titles. Omitting an identifier in front of the `#', `*' or `%'-character  selects  all
       users,  displays  or  windows because a prefix-match is performed. Note that on the affected display(s) a
       short message will describe what happened. Permission is checked for initiator of the "at"  command,  not
       for  the  owners  of  the affected display(s).  Note that the '#' character works as a comment introducer
       when it is preceded by whitespace. This can be escaped by prefixing a '\'.  Permission is checked for the
       initiator of the "at" command, not for the owners of the affected display(s).

       Caveat:  When  matching  against windows, the command is executed at least once per window. Commands that
       change the internal arrangement of windows (like "other") may be called  again.  In  shared  windows  the
       command  will  be  repeated for each attached display. Beware, when issuing toggle commands like "login"!
       Some commands (e.g. "process") require that a display is  associated  with  the  target  windows.   These
       commands may not work correctly under "at" looping over windows.

       attrcolor attrib [attribute/color-modifier]

       This  command  can  be  used  to highlight attributes by changing the color of the text. If the attribute
       attrib is in use, the specified attribute/color modifier is also applied. If no modifier  is  given,  the
       current  one  is  deleted.  See  the  "STRING  ESCAPES"  chapter  for  the syntax of the modifier. Screen
       understands two pseudo-attributes, "i" stands for high-intensity  foreground  color  and  "I"  for  high-
       intensity background color.

       Examples:

              attrcolor b "R"

       Change the color to bright red if bold text is to be printed.

              attrcolor u "-u b"

       Use blue text instead of underline.

              attrcolor b ".I"

       Use bright colors for bold text. Most terminal emulators do this already.

              attrcolor i "+b"

       Make bright colored text also bold.

       autodetach on|off

       Sets  whether  screen  will automatically detach upon hangup, which saves all your running programs until
       they are resumed with a screen -r command.  When turned off, a hangup signal will  terminate  screen  and
       all the processes it contains. Autodetach is on by default.

       autonuke on|off

       Sets  whether  a  clear  screen  sequence  should  nuke  all  the output that has not been written to the
       terminal. See also "obuflimit".

       backtick id lifespan autorefresh cmd args...

       backtick id

       Program the backtick command with the numerical id id.   The  output  of  such  a  command  is  used  for
       substitution  of  the  "%`"  string escape. The specified lifespan is the number of seconds the output is
       considered valid. After this time, the  command  is  run  again  if  a  corresponding  string  escape  is
       encountered.   The autorefresh parameter triggers an automatic refresh for caption and hardstatus strings
       after the specified number of seconds. Only the last line of output is used for substitution.

       If both the lifespan and the autorefresh parameters are zero, the backtick program is expected to stay in
       the background and generate output once in a while.  In this case, the command is executed right away and
       screen stores the last line of output. If a new line gets printed screen will automatically  refresh  the
       hardstatus or the captions.

       The second form of the command deletes the backtick command with the numerical id id.

       bce [on|off]

       Change   background-color-erase   setting.  If  "bce"  is  set  to  on,  all  characters  cleared  by  an
       erase/insert/scroll/clear operation will be displayed in the  current  background  color.  Otherwise  the
       default background color is used.

       bell_msg [message]

       When a bell character is sent to a background window, screen displays a notification in the message line.
       The notification message can be re-defined by this  command.   Each  occurrence  of  `%'  in  message  is
       replaced  by  the  number  of  the  window  to which a bell has been sent, and each occurrence of `^G' is
       replaced by the definition for bell in your termcap (usually an audible bell).  The default message is

                              'Bell in window %n'

       An empty message can be supplied to the "bell_msg" command to suppress output of a message line (bell_msg
       "").  Without parameter, the current message is shown.

       bind [class] key [command [args]]

       Bind  a  command  to a key.  By default, most of the commands provided by screen are bound to one or more
       keys as indicated in the "DEFAULT KEY BINDINGS" section, e.g. the command to create a new window is bound
       to  "C-c"  and  "c".   The  "bind"  command  can  be  used to redefine the key bindings and to define new
       bindings.  The key argument is either a single character, a  two-character  sequence  of  the  form  "^x"
       (meaning "C-x"), a backslash followed by an octal number (specifying the ASCII code of the character), or
       a backslash followed by a second character, such as "\^" or "\\".  The argument can also  be  quoted,  if
       you  like.   If no further argument is given, any previously established binding for this key is removed.
       The command argument can be any command listed in this section.

       If a command class is specified via the "-c" option, the key is bound for the specified  class.  Use  the
       "command"  command  to  activate  a class. Command classes can be used to create multiple command keys or
       multi-character bindings.

       Some examples:

                       bind ' ' windows
                       bind ^k
                       bind k
                       bind K kill
                       bind ^f screen telnet foobar
                       bind \033 screen -ln -t root -h 1000 9 su

       would bind the space key to the command that displays a list of windows  (so  that  the  command  usually
       invoked  by  "C-a  C-w"  would also be available as "C-a space"). The next three lines remove the default
       kill binding from "C-a C-k" and "C-a k".  "C-a K" is then bound to the kill command. Then it binds  "C-f"
       to  the  command  "create  a window with a TELNET connection to foobar", and bind "escape" to the command
       that creates an non-login window with a.k.a. "root" in slot #9, with a superuser shell and  a  scrollback
       buffer of 1000 lines.

                       bind -c demo1 0 select 10
                       bind -c demo1 1 select 11
                       bind -c demo1 2 select 12
                       bindkey "^B" command -c demo1

       makes "C-b 0" select window 10, "C-b 1" window 11, etc.

                       bind -c demo2 0 select 10
                       bind -c demo2 1 select 11
                       bind -c demo2 2 select 12
                       bind - command -c demo2

       makes "C-a - 0" select window 10, "C-a - 1" window 11, etc.

       bindkey [-d] [-m] [-a] [[-k|-t] string [cmd-args]]

       This command manages screen's input translation tables. Every entry in one of the tables tells screen how
       to react if a certain sequence of characters is encountered. There are  three  tables:  one  that  should
       contain  actions  programmed by the user, one for the default actions used for terminal emulation and one
       for screen's copy mode to do cursor movement. See section "INPUT TRANSLATION" for a list of  default  key
       bindings.

       If  the  -d  option is given, bindkey modifies the default table, -m changes the copy mode table and with
       neither option the user table is selected.  The argument string is the sequence of characters to which an
       action is bound. This can either be a fixed string or a termcap keyboard capability name (selectable with
       the -k option).

       Some keys on a VT100 terminal can send a different string if application  mode  is  turned  on  (e.g  the
       cursor  keys).   Such keys have two entries in the translation table. You can select the application mode
       entry by specifying the -a option.

       The -t option tells screen not to do inter-character timing. One cannot turn off the timing if a  termcap
       capability is used.

       Cmd  can be any of screen's commands with an arbitrary number of args.  If cmd is omitted the key-binding
       is removed from the table.

       Here are some examples of keyboard bindings:

               bindkey -d

       Show all of the default key bindings. The application mode entries are marked with [A].

               bindkey -k k1 select 1

       Make the "F1" key switch to window one.

               bindkey -t foo stuff barfoo

       Make "foo" an abbreviation of the word "barfoo". Timeout is disabled so that users can type slowly.

               bindkey "\024" mapdefault

       This key-binding makes "^T" an escape character for key-bindings. If you did  the  above  "stuff  barfoo"
       binding,  you  can enter the word "foo" by typing "^Tfoo". If you want to insert a "^T" you have to press
       the key twice (i.e., escape the escape binding).

               bindkey -k F1 command

       Make the F11 (not F1!) key an alternative screen escape (besides ^A).

       break[duration]

       Send a break signal for duration*0.25 seconds to this window.  For non-Posix systems  the  time  interval
       may  be  rounded  up to full seconds.  Most useful if a character device is attached to the window rather
       than a shell process (See also chapter "WINDOW TYPES"). The maximum duration of a break signal is limited
       to 15 seconds.

       blanker

       Activate the screen blanker. First the screen is cleared. If no blanker program is defined, the cursor is
       turned off, otherwise, the program is started and it's output is  written  to  the  screen.   The  screen
       blanker is killed with the first keypress, the read key is discarded.

       This command is normally used together with the "idle" command.

       blankerprg [program-args]

       Defines  a  blanker  program.  Disables  the  blanker  program  if  an empty argument is given. Shows the
       currently set blanker program if no arguments are given.

       breaktype [tcsendbreak|TIOCSBRK|TCSBRK]

       Choose one of the available methods of generating a break  signal  for  terminal  devices.  This  command
       should  affect  the  current window only.  But it still behaves identical to "defbreaktype". This will be
       changed in the future.  Calling "breaktype" with no parameter displays the break method for  the  current
       window.

       bufferfile [exchange-file]

       Change  the filename used for reading and writing with the paste buffer.  If the optional argument to the
       "bufferfile" command is omitted,  the  default  setting  ("/tmp/screen-exchange")  is  reactivated.   The
       following  example  will paste the system's password file into the screen window (using the paste buffer,
       where a copy remains):

                       C-a : bufferfile /etc/passwd
                       C-a < C-a ]
                       C-a : bufferfile

       bumpleft

       Swaps window with previous one on window list.

       bumpright

       Swaps window with next one on window list.

       c1 [on|off]

       Change c1 code processing. "C1 on" tells screen to treat the input characters  between  128  and  159  as
       control  functions.   Such  an 8-bit code is normally the same as ESC followed by the corresponding 7-bit
       code. The default setting is to process c1 codes and can be changed with the "defc1" command.  Users with
       fonts that have usable characters in the c1 positions may want to turn this off.

       caption [ top | bottom ] always|splitonly[string]

       caption string [string]

       This  command  controls  the display of the window captions. Normally a caption is only used if more than
       one window is shown on the display (split screen mode). But if the type is set to always screen  shows  a
       caption even if only one window is displayed. The default is splitonly.

       The  second form changes the text used for the caption. You can use all escapes from the "STRING ESCAPES"
       chapter. Screen uses a default of `%3n %t'.

       You can mix both forms by providing a string as an additional argument.

       You can have the caption displayed either at the top or bottom of the window.  The default is bottom.

       charset set

       Change the current character set slot designation and charset mapping.  The first four character  of  set
       are  treated  as  charset designators while the fifth and sixth character must be in range '0' to '3' and
       set the GL/GR charset mapping. On every position a '.' may be used to  indicate  that  the  corresponding
       charset/mapping  should  not  be  changed  (set  is  padded to six characters internally by appending '.'
       chars). New windows have "BBBB02" as default charset, unless a "encoding" command is active.
       The current setting can be viewed with the "info" command.

       chdir [directory]

       Change the current directory of screen to the specified directory or, if called without an  argument,  to
       your home directory (the value of the environment variable $HOME).  All windows that are created by means
       of the "screen" command from within ".screenrc" or by means of "C-a : screen ..." or "C-a c" use this  as
       their  default  directory.   Without  a  chdir command, this would be the directory from which screen was
       invoked.

       Hardcopy and log files are always written to the window's default directory, not the current directory of
       the  process  running  in the window.  You can use this command multiple times in your .screenrc to start
       various windows in different default directories, but the last chdir value will affect  all  the  windows
       you create interactively.

       cjkwidth [ on | off ]

       Treat ambiguous width characters as full/half width.

       clear

       Clears the current window and saves its image to the scrollback buffer.

       collapse

       Reorders window on window list, removing number gaps between them.

       colon [prefix]

       Allows  you  to  enter  ".screenrc"  command  lines.  Useful for on-the-fly modification of key bindings,
       specific window creation and changing settings. Note that the "set" keyword  no  longer  exists!  Usually
       commands  affect the current window rather than default settings for future windows. Change defaults with
       commands starting with 'def...'.

       If you consider this as the `Ex command mode' of screen, you may regard "C-a esc" (copy mode) as its  `Vi
       command mode'.

       command [-c class]

       This  command  has the same effect as typing the screen escape character (^A). It is probably only useful
       for key bindings.  If the "-c" option is given, select the specified command class.  See also "bind"  and
       "bindkey".

       compacthist [on|off]

       This  tells  screen  whether  to  suppress  trailing  blank lines when scrolling up text into the history
       buffer.

       console [on|off]

       Grabs or un-grabs the machines console output to a window.  Note: Only the owner of /dev/console can grab
       the console output.  This command is only available if the machine supports the ioctl TIOCCONS.

       copy

       Enter copy/scrollback mode. This allows you to copy text from the current window and its history into the
       paste buffer. In this mode a vi-like `full screen editor' is active:
       The editor's movement keys are:

       ────────────────────────────────────────────────────────────────
       h, C-h,        move the cursor left.
       left arrow
       ────────────────────────────────────────────────────────────────
       j, C-n,        move the cursor down.
       down arrow
       ────────────────────────────────────────────────────────────────
       k, C-p,        move the cursor up.
       up arrow
       ────────────────────────────────────────────────────────────────
       l ('el'),      move the cursor right.
       right arrow
       ────────────────────────────────────────────────────────────────
       0 (zero) C-a   move to the leftmost column.
       ────────────────────────────────────────────────────────────────
       + and -        positions one line up and down.
       ────────────────────────────────────────────────────────────────
       H, M and L     move the cursor to the leftmost  column  of  the
                      top, center or bottom line of the window.
       ────────────────────────────────────────────────────────────────
       |              moves to the specified absolute column.
       ────────────────────────────────────────────────────────────────
       g or home      moves to the beginning of the buffer.
       ────────────────────────────────────────────────────────────────
       G or end       moves  to  the specified absolute line (default:
                      end of buffer).
       ────────────────────────────────────────────────────────────────
       %              jumps to the specified percentage of the buffer.
       ────────────────────────────────────────────────────────────────
       ^ or $         move to the leftmost column,  to  the  first  or
                      last non-whitespace character on the line.
       ────────────────────────────────────────────────────────────────
       w, b, and e    move the cursor word by word.
       ────────────────────────────────────────────────────────────────
       B, E           move the cursor WORD by WORD (as in vi).
       ────────────────────────────────────────────────────────────────
       f/F, t/T       move  the  cursor  forward/backward  to the next
                      occurrence of the target. (eg, '3fy'  will  move
                      the cursor to the 3rd 'y' to the right.)
       ────────────────────────────────────────────────────────────────
       ; and ,        Repeat   the   last   f/F/t/T   command  in  the
                      same/opposite direction.
       ────────────────────────────────────────────────────────────────

       C-e and C-y    scroll the display up/down  by  one  line  while
                      preserving the cursor position.
       ────────────────────────────────────────────────────────────────
       C-u and C-d    scroll  the  display  up/down  by  the specified
                      amount of  lines  while  preserving  the  cursor
                      position. (Default: half screen-full).
       ────────────────────────────────────────────────────────────────
       C-b and C-f    scroll the display up/down a full screen.
       ────────────────────────────────────────────────────────────────

       Note:   Emacs   style   movement  keys  can  be  customized  by  a  .screenrc  command.   (E.g.  markkeys
       "h=^B:l=^F:$=^E") There is no simple method for a  full  emacs-style  keymap,  as  this  involves  multi-
       character codes.

       Some keys are defined to do mark and replace operations.

       The  copy  range  is  specified  by  setting two marks. The text between these marks will be highlighted.
       Press:

              space or enter to set the first or second mark respectively. If mousetrack is set to  `on',  marks
              can also be set using left mouse click.

              Y and y used to mark one whole line or to mark from start of line.

              W marks exactly one word.

       Any of these commands can be prefixed with a repeat count number by pressing digits

              0..9 which is taken as a repeat count.

       Example: "C-a C-[ H 10 j 5 Y" will copy lines 11 to 15 into the paste buffer.

       The following search keys are defined:

              / Vi-like search forward.

              ? Vi-like search backward.

              C-a s Emacs style incremental search forward.

              C-r Emacs style reverse i-search.

              n Find next search pattern.

              N Find previous search pattern.

       There  are  however some keys that act differently than in vi.  Vi does not allow one to yank rectangular
       blocks of text, but screen does. Press: c or C to set the left or right margin respectively. If no repeat
       count is given, both default to the current cursor position.

       Example: Try this on a rather full text screen:

              "C-a [ M 20 l SPACE c 10 l 5 j C SPACE".

       This  moves  one  to  the middle line of the screen, moves in 20 columns left, marks the beginning of the
       paste buffer, sets the left column, moves 5 columns down, sets the right column, and then marks  the  end
       of the paste buffer. Now try:

              "C-a [ M 20 l SPACE 10 l 5 j SPACE"

       and notice the difference in the amount of text copied.

       J  joins  lines.  It  toggles  between 4 modes: lines separated by a newline character (012), lines glued
       seamless, lines separated by a single whitespace and comma separated lines. Note that you can prepend the
       newline character with a carriage return character, by issuing a "crlf on".

       v  or  V is for all the vi users with ":set numbers" - it toggles the left margin between column 9 and 1.
       Press

       a before the final space key to toggle in append mode. Thus the contents of the paste buffer will not  be
       overwritten, but is appended to.

       A toggles in append mode and sets a (second) mark.

       >  sets  the  (second)  mark  and  writes  the  contents  of the paste buffer to the screen-exchange file
       (/tmp/screen-exchange per default) once copy-mode is finished.

       This example demonstrates how to dump the whole scrollback buffer to that file: "C-A [ g SPACE G $ >".

       C-g gives information about the current line and column.

       x or o exchanges the first mark and the current cursor position. You can use this to  adjust  an  already
       placed mark.

       C-l ('el') will redraw the screen.

       @ does nothing. Does not even exit copy mode.

       All keys not described here exit copy mode.

       copy_reg [key]

       No longer exists, use "readreg" instead.

       crlf [on|off]

       This  affects  the  copying of text regions with the `C-a [' command. If it is set to `on', lines will be
       separated by the two character sequence `CR' - `LF'.  Otherwise (default) only `LF'  is  used.   When  no
       parameter is given, the state is toggled.

       debug on|off

       Turns  runtime  debugging  on or off. If screen has been compiled with option -DDEBUG debugging available
       and is turned on per default. Note that this command only affects debugging output from the main "SCREEN"
       process correctly. Debug output from attacher processes can only be turned off once and forever.

       defc1 on|off

       Same  as  the  c1  command except that the default setting for new windows is changed. Initial setting is
       `on'.

       defautonuke on|off

       Same as the autonuke command except that the default setting for new displays is changed. Initial setting
       is `off'.  Note that you can use the special `AN' terminal capability if you want to have a dependency on
       the terminal type.

       defbce on|off

       Same as the bce command except that the default setting for new windows is changed.  Initial  setting  is
       `off'.

       defbreaktype [tcsendbreak|TIOCSBRK|TCSBRK]

       Choose  one  of  the  available  methods of generating a break signal for terminal devices. The preferred
       methods are tcsendbreak and TIOCSBRK.  The third, TCSBRK, blocks the  complete  screen  session  for  the
       duration  of the break, but it may be the only way to generate long breaks.  Tcsendbreak and TIOCSBRK may
       or may not produce long breaks with spikes (e.g. 4 per second). This is not only  system-dependent,  this
       also differs between serial board drivers.  Calling "defbreaktype" with no parameter displays the current
       setting.

       defcharset [set]

       Like the charset command except that the default setting  for  new  windows  is  changed.  Shows  current
       default if called without argument.

       defdynamictitle on|off

       Set  default  behaviour for new windows regarding if screen should change window title when seeing proper
       escape sequence. See also "TITLES (naming windows)" section.

       defescape xy

       Set the default command characters. This is equivalent to the "escape" except that it is useful multiuser
       sessions  only.  In a multiuser session "escape" changes the command character of the calling user, where
       "defescape" changes the default command characters for users that will be added later.

       defflow on|off|auto [interrupt]

       Same as the flow command except that the default setting for new windows is changed. Initial  setting  is
       `auto'.  Specifying "defflow auto interrupt" is the same as the command-line options -fa and -i.

       defgr on|off

       Same  as  the  gr  command except that the default setting for new windows is changed. Initial setting is
       `off'.

       defhstatus [status]

       The hardstatus line that all new windows will get is set to status.  This command is useful to  make  the
       hardstatus  of  every window display the window number or title or the like.  Status may contain the same
       directives as in the window messages, but the directive escape character is '^E' (octal 005)  instead  of
       '%'.  This was done to make a misinterpretation of program generated hardstatus lines impossible.  If the
       parameter status is omitted, the current default string is displayed.  Per default the hardstatus line of
       new windows is empty.

       defencoding enc

       Same  as the encoding command except that the default setting for new windows is changed. Initial setting
       is the encoding taken from the terminal.

       deflog on|off

       Same as the log command except that the default setting for new windows is changed.  Initial  setting  is
       `off'.

       deflogin on|off

       Same as the login command except that the default setting for new windows is changed. This is initialized
       with `on' as distributed (see config.h.in).

       defmode mode

       The mode of each newly allocated pseudo-tty is set to mode.  Mode is an octal number.  When no  "defmode"
       command is given, mode 0622 is used.

       defmonitor on|off

       Same  as  the monitor command except that the default setting for new windows is changed. Initial setting
       is `off'.

       defmousetrack on|off

       Same as the mousetrack command except that the default  setting  for  new  windows  is  changed.  Initial
       setting is `off'.

       defnonblock on|off|numsecs

       Same  as the nonblock command except that the default setting for displays is changed. Initial setting is
       `off'.

       defobuflimit limit

       Same as the obuflimit command except that the default  setting  for  new  displays  is  changed.  Initial
       setting  is  256 bytes.  Note that you can use the special 'OL' terminal capability if you want to have a
       dependency on the terminal type.

       defscrollback num

       Same as the scrollback command except that the default  setting  for  new  windows  is  changed.  Initial
       setting is 100.

       defshell command

       Synonym to the shell .screenrc command. See there.

       defsilence on|off

       Same  as  the silence command except that the default setting for new windows is changed. Initial setting
       is `off'.

       defslowpaste msec

       Same as the slowpaste command except that the default setting for new windows is changed. Initial setting
       is 0 milliseconds, meaning `off'.

       defutf8 on|off

       Same  as  the utf8 command except that the default setting for new windows is changed. Initial setting is
       `on' if screen was started with "-U", otherwise `off'.

       defwrap on|off

       Same as the wrap command except that the default setting for new windows is changed. Initially  line-wrap
       is on and can be toggled with the "wrap" command ("C-a r") or by means of "C-a : wrap on|off".

       defwritelock on|off|auto

       Same  as  the  writelock  command  except  that the default setting for new windows is changed. Initially
       writelocks will off.

       detach [-h]

       Detach the screen session (disconnect it from the terminal and put it into the background).  This returns
       you  to the shell where you invoked screen.  A detached screen can be resumed by invoking screen with the
       -r option (see also section "COMMAND-LINE OPTIONS"). The -h option tells screen to immediately close  the
       connection to the terminal ("hangup").

       dinfo

       Show  what  screen  thinks about your terminal. Useful if you want to know why features like color or the
       alternate charset don't work.

       displays

       Shows a tabular listing of all currently connected user front-ends (displays).  This is most  useful  for
       multiuser sessions.  The following keys can be used in displays list:

       ──────────────────────────────────────────────────────────────
       k, C-p, or up           Move up one line.
       ──────────────────────────────────────────────────────────────
       j, C-n, or down         Move down one line.
       ──────────────────────────────────────────────────────────────
       C-a or home             Move to the first line.
       ──────────────────────────────────────────────────────────────
       C-e or end              Move to the last line.
       ──────────────────────────────────────────────────────────────
       C-u or C-d              Move one half page up or down.
       ──────────────────────────────────────────────────────────────
       C-b or C-f              Move one full page up or down.
       ──────────────────────────────────────────────────────────────

       mouseclick              Move  to the selected line. Available
                               when "mousetrack" is set to on.
       ──────────────────────────────────────────────────────────────
       space                   Refresh the list
       ──────────────────────────────────────────────────────────────
       d                       Detach that display
       ──────────────────────────────────────────────────────────────
       D                       Power detach that display
       ──────────────────────────────────────────────────────────────
       C-g, enter, or escape   Exit the list
       ──────────────────────────────────────────────────────────────

       The following is an example of what "displays" could look like:
              xterm 80x42 jnweiger@/dev/ttyp4     0(m11)   &rWx
              facit 80x24 mlschroe@/dev/ttyhf nb 11(tcsh)   rwx
              xterm 80x42 jnhollma@/dev/ttyp5     0(m11)   &R.x
               (A)   (B)     (C)     (D)     (E) (F)(G)   (H)(I)

       The legend is as follows:

              (A) The terminal type known by screen for this display.

              (B) Displays geometry as width x height.

              (C) Username who is logged in at the display.

              (D) Device name of the display or the attached device

              (E) Display is in blocking or nonblocking mode.  The available modes are "nb", "NB",  "Z<",  "Z>",
              and "BL".

              (F) Number of the window

              (G) Name/title of window

              (H) Whether the window is shared

              (I) Window permissions. Made up of three characters.

              ┌────────────────────────────────────────────────────────┐
              │             Window permissions indicators              │
              ├─────────────────┬──────────────────┬───────────────────┤
              │ 1st character   │  2nd character   │   3rd character   │
              ├────┬────────────┼─────┬────────────┼─────┬─────────────┤
              │-   │no read     │ -   │no write    │ -   │no execute   │
              ├────┼────────────┼─────┼────────────┼─────┼─────────────┤
              │r   │read        │ w   │write       │ x   │execute      │
              ├────┼────────────┼─────┼────────────┼─────┼─────────────┤
              │    │            │ W   │own wlock   │     │             │
              ├────┴────────────┴─────┴────────────┴─────┴─────────────┤
              │Indicators of permissions suppressed by a foreign wlock │
              ├────┬────────────┬─────┬────────────┬─────┬─────────────┤
              │R   │read only   │ .   │no write    │     │             │
              └────┴────────────┴─────┴────────────┴─────┴─────────────┘
              "displays"  needs  a  region size of at least 10 characters wide and 5 characters high in order to
              display.

       digraph [preset[unicode-value]]

       This command prompts the user for a digraph sequence. The next two characters typed are looked  up  in  a
       builtin  table  and  the  resulting  character  is inserted in the input stream. For example, if the user
       enters 'a"', an a-umlaut will be inserted. If the first character entered is  a  0  (zero),  screen  will
       treat the following characters (up to three) as an octal number instead.  The optional argument preset is
       treated as user input, thus one can create an "umlaut" key.  For example the command "bindkey ^K  digraph
       '"'"  enables  the  user  to  generate  an a-umlaut by typing CTRL-K a.  When a non-zero unicode-value is
       specified, a new digraph is created with the specified preset. The digraph is unset if a  zero  value  is
       provided for the unicode-value.

       dumptermcap

       Write  the  termcap  entry for the virtual terminal optimized for the currently active window to the file
       ".termcap" in the user's "$HOME/.screen" directory (or  wherever  screen  stores  its  sockets.  See  the
       "FILES"  section  below).   This  termcap  entry  is  identical  to the value of the environment variable
       $TERMCAP that is set up by screen for each window. For terminfo based systems you  will  need  to  run  a
       converter like captoinfo and then compile the entry with tic.

       dynamictitle on|off

       Change  behaviour  for  windows  regarding if screen should change window title when seeing proper escape
       sequence. See also "TITLES (naming windows)" section.

       echo [-n] message

       The echo command may be used to annoy screen users with a 'message of the day'. Typically installed in  a
       global /etc/screenrc.  The option "-n" may be used to suppress the line feed.  See also "sleep".  Echo is
       also useful for online checking of environment variables.

       encoding enc [enc]

       Tell screen how to interpret the input/output. The first  argument  sets  the  encoding  of  the  current
       window.  Each  window  can  emulate  a  different  encoding. The optional second parameter overwrites the
       encoding of the connected terminal. It should never be needed as screen uses the locale setting to detect
       the  encoding.  There is also a way to select a terminal encoding depending on the terminal type by using
       the "KJ" termcap entry.

       Supported encodings are eucJP, SJIS, eucKR, eucCN, Big5, GBK, KOI8-R, KOI8-U, CP1251,  UTF-8,  ISO8859-2,
       ISO8859-3, ISO8859-4, ISO8859-5, ISO8859-6, ISO8859-7, ISO8859-8, ISO8859-9, ISO8859-10, ISO8859-15, jis.

       See also "defencoding", which changes the default setting of a new window.

       escape xy

       Set  the  command  character to x and the character generating a literal command character (by triggering
       the "meta" command) to y (similar to the -e option).  Each argument is either a single character, a  two-
       character  sequence of the form "^x" (meaning "C-x"), a backslash followed by an octal number (specifying
       the ASCII code of the character), or a backslash followed by a second character, such as  "\^"  or  "\\".
       The default is "^Aa".

       eval command1[command2 ...]

       Parses and executes each argument as separate command.

       exec [[fdpat]newcommand [args ...]]

       Run  a  unix  subprocess  (specified  by an executable path newcommand and its optional arguments) in the
       current window. The flow of data between newcommands stdin/stdout/stderr, the process originally  started
       in the window (let us call it "application-process") and screen itself (window) is controlled by the file
       descriptor pattern fdpat.  This pattern is basically  a  three  character  sequence  representing  stdin,
       stdout  and  stderr of newcommand. A dot (.) connects the file descriptor to screen.  An exclamation mark
       (!) causes the file descriptor to be connected to the application-process. A  colon  (:)  combines  both.
       User input will go to newcommand unless newcommand receives the application-process' output (fdpats first
       character is `!' or `:') or a pipe symbol (|) is added (as a fourth character) to the end of fdpat.

       Invoking `exec' without arguments shows name and arguments of the currently running  subprocess  in  this
       window. Only one subprocess a time can be running in each window.

       When a subprocess is running the `kill' command will affect it instead of the windows process.

       Refer to the postscript file `doc/fdpat.ps' for a confusing illustration of all 21 possible combinations.
       Each drawing shows the digits 2,1,0 representing the three file descriptors of newcommand. The box marked
       `W'  is  the  usual  pty  that  has the application-process on its slave side.  The box marked `P' is the
       secondary pty that now has screen at its master side.

       Abbreviations: Whitespace between the word `exec' and fdpat and the command can be omitted. Trailing dots
       and  a  fdpat  consisting only of dots can be omitted. A simple `|' is synonymous for the pattern `!..|';
       the word exec can be omitted here and can always be replaced by `!'.

       Examples:

              exec ... /bin/sh

              exec /bin/sh

              !/bin/sh

                     Creates another shell in the same window, while the original shell is still running. Output
                     of both shells is displayed and user input is sent to the new /bin/sh.

              exec !.. stty 19200

              exec ! stty 19200

              !!stty 19200

                     Set  the  speed  of  the  window's  tty.  If your stty command operates on stdout, then add
                     another `!'.

              exec !..| less

              |less

                     This adds a pager to the window output. The special character `|' is  needed  to  give  the
                     user  control  over  the  pager  although it gets its input from the window's process. This
                     works, because less listens on stderr (a behavior that screen would not expect without  the
                     `|')  when  its stdin is not a tty.  Less versions newer than 177 fail miserably here; good
                     old pg still works.

              !:sed -n s/.*Error.*/\007/p

                     Sends window output to both, the user and the sed command. The sed  inserts  an  additional
                     bell  character  (oct.  007) to the window output seen by screen.  This will cause "Bell in
                     window x" messages, whenever the string "Error" appears in the window.

       fit

       Change the window size to the size of the current region. This command is needed because  screen  doesn't
       adapt the window size automatically if the window is displayed more than once.

       flow   [on|off|auto]

       Sets  the  flow-control  mode  for  this window.  Without parameters it cycles the current window's flow-
       control setting from "automatic" to "on" to "off".  See the discussion on "FLOW-CONTROL" later on in this
       document for full details and note, that this is subject to change in future releases.  Default is set by
       `defflow'.

       focus [next|prev|up|down|left|right|top|bottom]

       Move the input focus to the next region. This is done in a cyclic way so that  the  top  left  region  is
       selected  after  the bottom right one. If no option is given it defaults to `next'. The next region to be
       selected is determined by how the regions are layered.  Normally, the next region in the same layer would
       be  selected.   However, if that next region contains one or more layers, the first region in the highest
       layer is selected first. If you are at the last region of the current layer, `next' will move  the  focus
       to  the next region in the lower layer (if there is a lower layer).  `Prev' cycles in the opposite order.
       See "split" for more information about layers.

       The rest of the options (`up', `down', `left', `right', `top', and  `bottom')  are  more  indifferent  to
       layers.  The  option `up' will move the focus upward to the region that is touching the upper left corner
       of the current region.  `Down' will move downward to the region that is touching the lower left corner of
       the  current  region.  The  option `left' will move the focus leftward to the region that is touching the
       upper left corner of the current region, while `right' will move rightward to the region that is touching
       the  upper right corner of the current region. Moving left from a left most region or moving right from a
       right most region will result in no action.

       The option `top' will move the focus to the very first region in the upper list corner of the screen, and
       `bottom'  will  move  to  the  region in the bottom right corner of the screen. Moving up from a top most
       region or moving down from a bottom most region will result in no action.

       Useful bindings are (h, j, k, and l as in vi)
           bind h focus left
           bind j focus down
           bind k focus up
           bind l focus right
           bind t focus top
           bind b focus bottom
       Note that k is traditionally bound to the kill command.

       focusminsize [ ( width|max|_ ) ( height|max|_ ) ]

       This forces any currently selected region to be automatically  resized  at  least  a  certain  width  and
       height.  All  other surrounding regions will be resized in order to accommodate.  This constraint follows
       every time the "focus" command is used. The "resize" command can be used to increase either dimension  of
       a  region,  but  never  below  what  is set with "focusminsize". The underscore `_' is a synonym for max.
       Setting a width and height of `0 0' (zero zero) will undo any constraints and allow for manual  resizing.
       Without any parameters, the minimum width and height is shown.

       gr [on|off]

       Turn  GR  charset switching on/off. Whenever screen sees an input character with the 8th bit set, it will
       use the charset stored in the GR slot and print the character with the 8th bit stripped. The default (see
       also "defgr") is not to process GR switching because otherwise the ISO88591 charset would not work.

       group [grouptitle]

       Change  or  show  the  group the current window belongs to. Windows can be moved around between different
       groups by specifying the name of the destination group. Without specifying a  group,  the  title  of  the
       current group is displayed.

       hardcopy [-h] [file]

       Writes out the currently displayed image to the file file, or, if no filename is specified, to hardcopy.n
       in the default directory, where n is the number of the current window.  This either appends or overwrites
       the  file  if  it  exists.  See  below.   If  the  option  -h is specified, dump also the contents of the
       scrollback buffer.

       hardcopy_append on|off

       If set to "on", screen will append to the "hardcopy.n" files created by the command  "C-a  h",  otherwise
       these files are overwritten each time.  Default is `off'.

       hardcopydir directory

       Defines  a  directory  where  hardcopy  files  will be placed. If unset, hardcopys are dumped in screen's
       current working directory.

       hardstatus [on|off]

       hardstatus [always]firstline|lastline|message|ignore[string]

       hardstatus string[string]

       This command configures the use and emulation of the terminal's hardstatus line. The first  form  toggles
       whether  screen will use the hardware status line to display messages. If the flag is set to `off', these
       messages are overlaid in reverse video mode at the display line. The default setting is `on'.

       The second form tells screen what to do if  the  terminal  doesn't  have  a  hardstatus  line  (i.e.  the
       termcap/terminfo capabilities "hs", "ts", "fs" and "ds" are not set).  When "firstline/lastline" is used,
       screen will reserve the first/last line of the  display  for  the  hardstatus.  "message"  uses  screen's
       message  mechanism  and  "ignore"  tells screen never to display the hardstatus.  If you prepend the word
       "always" to the type (e.g., "alwayslastline"), screen will use the type even if the terminal  supports  a
       hardstatus.

       The  third form specifies the contents of the hardstatus line.  '%h' is used as default string, i.e., the
       stored hardstatus of the current  window  (settable  via  "ESC]0;<string>^G"  or  "ESC_<string>ESC\")  is
       displayed.  You can customize this to any string you like including the escapes from the "STRING ESCAPES"
       chapter. If you leave out the argument string, the current string is displayed.

       You can mix the second and third form by providing the string as additional argument.

       height [-w|-d] [lines [cols]]

       Set the display height to a specified number of lines. When no argument is given it  toggles  between  24
       and  42  lines  display.  You  can also specify a width if you want to change both values.  The -w option
       tells screen to leave the display size unchanged and just set the window size, -d vice versa.

       help[class]

       Not really a online help, but displays a help screen showing you all the key bindings.  The  first  pages
       list  all  the  internal  commands followed by their current bindings.  Subsequent pages will display the
       custom commands, one command per key.  Press space when you're done reading each page, or return to  exit
       early.  All other characters are ignored. If the "-c" option is given, display all bound commands for the
       specified command class.  See also "DEFAULT KEY BINDINGS" section.

       history

       Usually users work with a shell that allows easy access to previous commands.  For example  csh  has  the
       command  "!!"  to  repeat  the  last  command executed.  Screen allows you to have a primitive way of re-
       calling "the command that started ...": You just type the first letter of that command, then hit `C-a  {'
       and  screen  tries  to  find  a previous line that matches with the `prompt character' to the left of the
       cursor. This line is pasted into this window's input queue.  Thus you have a crude command history  (made
       up by the visible window and its scrollback buffer).

       hstatus status

       Change the window's hardstatus line to the string status.

       idle [timeout[cmd-args]]

       Sets a command that is run after the specified number of seconds inactivity is reached. This command will
       normally be the "blanker" command to create a screen blanker, but it can be any screen  command.   If  no
       command  is  specified,  only the timeout is set. A timeout of zero (or the special timeout off) disables
       the timer.  If no arguments are given, the current settings are displayed.

       ignorecase [on|off]

       Tell screen to ignore the case of characters in searches. Default is  `off'.  Without  any  options,  the
       state of ignorecase is toggled.

       info

       Uses  the  message  line to display some information about the current window: the cursor position in the
       form "(column,row)" starting with "(1,1)", the terminal width and height plus the size of the  scrollback
       buffer  in  lines,  like in "(80,24)+50", the current state of window XON/XOFF flow control is shown like
       this (See also section FLOW CONTROL):

       ┌─────────┬──────────────────────────────────────────────────────────┐
       │+flow    │ automatic flow control, currently on.                    │
       ├─────────┼──────────────────────────────────────────────────────────┤
       │-flow    │ automatic flow control, currently off.                   │
       ├─────────┼──────────────────────────────────────────────────────────┤
       │+(+)flow │ flow control enabled. Agrees with automatic control.     │
       ├─────────┼──────────────────────────────────────────────────────────┤
       │-(+)flow │ flow control disabled. Disagrees with automatic control. │
       ├─────────┼──────────────────────────────────────────────────────────┤
       │+(-)flow │ flow control enabled. Disagrees with automatic control.  │
       ├─────────┼──────────────────────────────────────────────────────────┤
       │-(-)flow │ flow control disabled. Agrees with automatic control.    │
       └─────────┴──────────────────────────────────────────────────────────┘
       The current line wrap setting (`+wrap' indicates enabled, `-wrap' not) is also shown.  The  flags  `ins',
       `org',  `app',  `log',  `mon'  or  `nored'  are displayed when the window is in insert mode, origin mode,
       application-keypad mode, has output logging, activity monitoring or partial redraw enabled.

       The currently active character set (G0, G1, G2, or G3) and in square brackets the terminal character sets
       that  are  currently  designated  as  G0  through G3 is shown. If the window is in UTF-8 mode, the string
       "UTF-8" is shown instead.

       Additional modes depending on the type of the window are displayed at the end of  the  status  line  (See
       also chapter "WINDOW TYPES").

       If  the state machine of the terminal emulator is in a non-default state, the info line is started with a
       string identifying the current state.

       For system information use the "time" command.

       ins_reg [key]

       No longer exists, use "paste" instead.

       kill

       Kill current window.

       If there is an `exec' command running then it is killed. Otherwise the process  (shell)  running  in  the
       window receives a HANGUP condition, the window structure is removed and screen (your display) switches to
       another window.  When the last window is destroyed, screen exits.  After a kill screen  switches  to  the
       previously displayed window.

       Note:  Emacs  users  should keep this command in mind, when killing a line.  It is recommended not to use
       "C-a" as the screen escape key or to rebind kill to "C-a K".

       lastmsg

       Redisplay the last contents of the message/status line.  Useful if you're typing when a message  appears,
       because   the  message  goes away when you press a key (unless your terminal has a hardware status line).
       Refer to the commands "msgwait" and "msgminwait" for fine tuning.

       layout new [title]

       Create a new layout. The screen will change to one whole region and be switched to the blank window. From
       here, you build the regions and the windows they show as you desire. The new layout will be numbered with
       the smallest available integer, starting with zero. You can optionally give a title to your  new  layout.
       Otherwise,  it  will have a default title of "layout". You can always change the title later by using the
       command layout title.

       layout remove [n|title]

       Remove, or in other words, delete the specified layout. Either the number or the title can be  specified.
       Without either specification, screen will remove the current layout.

       Removing a layout does not affect your set windows or regions.

       layout next

       Switch to the next layout available

       layout prev

       Switch to the previous layout available

       layout select [n|title]

       Select the desired layout. Either the number or the title can be specified. Without either specification,
       screen will prompt and ask which screen is desired. To see which layouts are available,  use  the  layout
       show command.

       layout show

       List  on  the  message  line the number(s) and title(s) of the available layout(s). The current layout is
       flagged.

       layout title [title]

       Change or display the title of the current layout. A string given  will  be  used  to  name  the  layout.
       Without any options, the current title and number is displayed on the message line.

       layout number [n]

       Change  or  display the number of the current layout. An integer given will be used to number the layout.
       Without any options, the current number and title is displayed on the message line.

       layout attach [title|:last]

       Change or display which layout to reattach back to. The default is :last, which tells screen to  reattach
       back  to  the  last  used layout just before detachment. By supplying a title, You can instruct screen to
       reattach to a particular layout regardless which one was used at the  time  of  detachment.  Without  any
       options, the layout to reattach to will be shown in the message line.

       layout save [n|title]

       Remember  the  current  arrangement  of  regions.  When  used,  screen  will  remember the arrangement of
       vertically and horizontally split regions.  This  arrangement  is  restored  when  a  screen  session  is
       reattached  or switched back from a different layout. If the session ends or the screen process dies, the
       layout arrangements are lost. The layout dump command should help in this siutation. If a number or title
       is  supplied, screen will remember the arrangement of that particular layout. Without any options, screen
       will remember the current layout.

       Saving your regions can be done automatically by using the layout autosave command.

       layout autosave [on|off]

       Change or display the status of automatcally saving layouts. The default is on, meaning  when  screen  is
       detached  or  changed to a different layout, the arrangement of regions and windows will be remembered at
       the time of change and restored upon return.  If autosave is set to off, that arrangement  will  only  be
       restored  to  either to the last manual save, using layout save, or to when the layout was first created,
       to a single region with a single window. Without either an on or off, the current status is displayed  on
       the message line.

       layout dump [filename]

       Write  to  a file the order of splits made in the current layout. This is useful to recreate the order of
       your regions used in your current layout. Only the current layout is recorded. While  the  order  of  the
       regions  are  recorded, the sizes of those regions and which windows correspond to which regions are not.
       If no filename is specified, the default is layout-dump, saved in the directory that the  screen  process
       was started in. If the file already exists, layout dump will append to that file. As an example:

                C-a : layout dump /home/user/.screenrc

       will save or append the layout to the user's .screenrc file.

       license

       Display  the  disclaimer  page.  This is done whenever screen is started without options, which should be
       often enough. See also the "startup_message" command.

       lockscreen

       Lock this display.  Call a screenlock program (/local/bin/lck or /usr/bin/lock or a builtin if  no  other
       is available). Screen does not accept any command keys until this program terminates. Meanwhile processes
       in the windows may continue, as the windows are in the `detached' state. The screenlock  program  may  be
       changed  through  the  environment variable $LOCKPRG (which must be set in the shell from which screen is
       started) and is executed with the user's uid and gid.

       Warning: When you leave other shells unlocked and you have no password set on screen, the lock  is  void:
       One could easily re-attach from an unlocked shell. This feature should rather be called `lockterminal'.

       log [on|off]

       Start/stop  writing  output  of  the  current  window  to  a  file  "screenlog.n" in the window's default
       directory, where n is the number of the current window. This filename can be changed with  the  `logfile'
       command.  If  no  parameter is given, the state of logging is toggled. The session log is appended to the
       previous contents of the file if it already  exists.  The  current  contents  and  the  contents  of  the
       scrollback history are not included in the session log.  Default is `off'.

       logfile filename

       logfile flush secs

       Defines  the  name  the  log  files  will get. The default is "screenlog.%n". The second form changes the
       number of seconds screen will wait before flushing the logfile buffer to  the  file-system.  The  default
       value is 10 seconds.

       login [on|off]

       Adds  or removes the entry in the utmp database file for the current window.  This controls if the window
       is `logged in'.  When no parameter is given, the login state of the window is toggled.   Additionally  to
       that  toggle,  it is convenient having a `log in' and a `log out' key. E.g. `bind I login on' and `bind O
       login off' will map these keys to be C-a I and C-a O.  The default setting  (in  config.h.in)  should  be
       "on"  for  a  screen  that  runs under suid-root.  Use the "deflogin" command to change the default login
       state for new windows. Both commands are only present when screen has been compiled with utmp support.

       logtstamp [on|off]

       logtstamp after [secs]

       logtstamp string
       [string]

       This command controls logfile time-stamp mechanism of screen.  If time-stamps  are  turned  "on",  screen
       adds  a  string  containing the current time to the logfile after two minutes of inactivity.  When output
       continues and more than another two minutes have passed, a second time-stamp is  added  to  document  the
       restart of the output. You can change this timeout with the second form of the command. The third form is
       used for customizing the time-stamp string (`-- %n:%t -- time-stamp -- %M/%d/%y %c:%s --\n' by default).

       mapdefault

       Tell screen that the next input character should only be looked up in the default bindkey table. See also
       "bindkey".

       mapnotnext

       Like mapdefault, but don't even look in the default bindkey table.

       maptimeout [timeout]

       Set  the  inter-character  timer  for  input  sequence  detection to a timeout of timeout ms. The default
       timeout is 300ms. Maptimeout with no arguments shows the current setting.  See also "bindkey".

       markkeys string

       This is a method of changing  the  keymap  used  for  copy/history  mode.   The  string  is  made  up  of
       oldchar=newchar  pairs  which  are separated by `:'. Example: The string "B=^B:F=^F" will change the keys
       `C-b' and `C-f' to the vi style binding (scroll up/down fill page).   This  happens  to  be  the  default
       binding  for  `B'  and  `F'.  The command "markkeys h=^B:l=^F:$=^E" would set the mode for an emacs-style
       binding.  If your terminal sends characters, that cause you to abort copy mode,  then  this  command  may
       help  by  binding  these  characters  to  do  nothing.  The no-op character is `@' and is used like this:
       "markkeys @=L=H" if you do not want to use the `H' or `L' commands any longer.  As shown in this example,
       multiple keys can be assigned to one function in a single statement.

       maxwin num

       Set the maximum window number screen will create. Doesn't affect already existing windows. The number can
       be increased only when there are no existing windows.

       meta

       Insert the command character (C-a) in the current window's input stream.

       monitor [on|off]

       Toggles activity monitoring of windows.  When monitoring is turned on and an affected window is  switched
       into  the  background, you will receive the activity notification message in the status line at the first
       sign of output and the window will also be marked with an `@' in the window-status  display.   Monitoring
       is initially off for all windows.

       mousetrack [on|off]

       This command determines whether screen will watch for mouse clicks. When this command is enabled, regions
       that have been split in various ways can be selected by pointing to them with a mouse  and  left-clicking
       them.  Without  specifying  on or off, the current state is displayed. The default state is determined by
       the "defmousetrack" command.

       msgminwait sec

       Defines the time screen delays a new message when one message is currently displayed.  The default  is  1
       second.

       msgwait sec

       Defines  the  time  a message is displayed if screen is not disturbed by other activity. The default is 5
       seconds.

       multiuser on|off

       Switch between singleuser and multiuser mode. Standard screen operation is singleuser. In multiuser  mode
       the  commands  `acladd',  `aclchg', `aclgrp' and `acldel' can be used to enable (and disable) other users
       accessing this screen session.

       nethack on|off

       Changes the kind of error messages used by screen.  When you are familiar with the  game  "nethack",  you
       may  enjoy  the  nethack-style messages which will often blur the facts a little, but are much funnier to
       read. Anyway, standard messages often tend to be unclear as well.
       This option is only available if screen was compiled with the NETHACK flag defined. The  default  setting
       is  then determined by the presence of the environment variable $NETHACKOPTIONS and the file ~/.nethackrc
       - if either one is present, the default is on.

       next

       Switch to the next window.  This command can be used repeatedly to cycle through the list of windows.

       nonblock [on|off|numsecs]

       Tell screen how to deal with user interfaces (displays) that cease to accept output. This can happen if a
       user presses ^S or a TCP/modem connection gets cut but no hangup is received. If nonblock is off (this is
       the default) screen waits until the display restarts to accept the output.  If  nonblock  is  on,  screen
       waits  until  the  timeout  is  reached  (on  is  treated  as  1s).  If the display still doesn't receive
       characters, screen will consider it "blocked" and stop sending characters to  it.  If  at  some  time  it
       restarts to accept characters, screen will unblock the display and redisplay the updated window contents.

       number [[+|-]n]

       Change the current window's number. If the given number n is already used by another window, both windows
       exchange their numbers. If no argument is specified, the current window  number  (and  title)  is  shown.
       Using `+' or `-' will change the window's number by the relative amount specified.

       obuflimit [limit]

       If  the  output  buffer  contains more bytes than the specified limit, no more data will be read from the
       windows. The default value is 256. If you have a fast display (like xterm), you can set it to some higher
       value. If no argument is specified, the current setting is displayed.

       only

       Kill all regions but the current one.

       other

       Switch to the window displayed previously. If this window does no longer exist, other has the same effect
       as next.

       partial on|off

       Defines whether the display should be refreshed (as  with  redisplay)  after  switching  to  the  current
       window.  This  command  only  affects  the  current  window.   To  immediately affect all windows use the
       allpartial command.  Default is `off', of course.  This default  is  fixed,  as  there  is  currently  no
       defpartial command.

       password [crypted_pw]

       Present a crypted password in your ".screenrc" file and screen will ask for it, whenever someone attempts
       to resume a detached. This is useful if you have privileged programs running under screen and you want to
       protect  your  session  from  reattach  attempts  by  another  user  masquerading  as  your uid (i.e. any
       superuser.)  If no crypted password is specified, screen prompts twice for typing a password  and  places
       its encryption in the paste buffer.  Default is `none', this disables password checking.

       paste [registers [dest_reg]]

       Write  the  (concatenated)  contents of the specified registers to the stdin queue of the current window.
       The register '.' is treated as the paste buffer. If no parameter is given the  user  is  prompted  for  a
       single  register  to  paste.  The paste buffer can be filled with the copy, history and readbuf commands.
       Other registers can be filled with the register, readreg and paste commands.  If paste is called  with  a
       second  argument,  the  contents of the specified registers is pasted into the named destination register
       rather than the window. If '.' is used  as  the  second  argument,  the  displays  paste  buffer  is  the
       destination.   Note,  that  "paste"  uses  a  wide  variety  of  resources: Whenever a second argument is
       specified no current window is needed. When the source specification only  contains  registers  (not  the
       paste buffer) then there need not be a current display (terminal attached), as the registers are a global
       resource. The paste buffer exists once for every user.

       pastefont [on|off]

       Tell screen to include font information in the paste buffer. The default is not to do so. This command is
       especially useful for multi character fonts like kanji.

       pow_break

       Reopen the window's terminal line and send a break condition. See `break'.

       pow_detach

       Power detach.  Mainly the same as detach, but also sends a HANGUP signal to the parent process of screen.
       CAUTION: This will result in a logout, when screen was started from your login-shell.

       pow_detach_msg [message]

       The message specified here is output whenever a `Power detach'  was  performed.  It  may  be  used  as  a
       replacement  for  a logout message or to reset baud rate, etc.  Without parameter, the current message is
       shown.

       prev

       Switch to the window with the next lower number.  This command can be used repeatedly  to  cycle  through
       the list of windows.

       printcmd [cmd]

       If  cmd  is  not  an empty string, screen will not use the terminal capabilities "po/pf" if it detects an
       ansi print sequence ESC [ 5 i, but pipe the output into cmd.  This should  normally  be  a  command  like
       "lpr"  or  "'cat  >  /tmp/scrprint'".  printcmd without a command displays the current setting.  The ansi
       sequence ESC \ ends printing and closes the pipe.

       Warning: Be careful with this command! If other user have write access to your  terminal,  they  will  be
       able to fire off print commands.

       process [key]

       Stuff  the  contents of the specified register into screen's input queue. If no argument is given you are
       prompted for a register name. The text is parsed as if it had been typed in  from  the  user's  keyboard.
       This command can be used to bind multiple actions to a single key.

       quit

       Kill  all  windows  and  terminate  screen.   Note that on VT100-style terminals the keys C-4 and C-\ are
       identical.  This makes the default bindings dangerous: Be careful not to  type  C-a  C-4  when  selecting
       window no. 4.  Use the empty bind command (as in "bind '^\'") to remove a key binding.

       readbuf [encoding] [filename]

       Reads  the contents of the specified file into the paste buffer.  You can tell screen the encoding of the
       file via the -e option.  If no file is  specified,  the  screen-exchange  filename  is  used.   See  also
       "bufferfile" command.

       readreg [encoding] [register [filename]]

       Does  one  of  two things, dependent on number of arguments: with zero or one arguments it duplicates the
       paste buffer contents into the register specified or entered at the prompt. With two arguments  it  reads
       the contents of the named file into the register, just as readbuf reads the screen-exchange file into the
       paste buffer.  You can tell screen the encoding of the file via the -e  option.   The  following  example
       will paste the system's password file into the screen window (using register p, where a copy remains):

                C-a : readreg p /etc/passwd
                C-a : paste p

       redisplay

       Redisplay the current window. Needed to get a full redisplay when in partial redraw mode.

       register [-eencoding]key-string

       Save  the  specified  string to the register key.  The encoding of the string can be specified via the -e
       option.  See also the "paste" command.

       remove

       Kill the current region. This is a no-op if there is only one region.

       removebuf

       Unlinks the screen-exchange file used by the commands "writebuf" and "readbuf".

       rendition bell | monitor | silence | so  attr  [ color ]

       Change the way screen renders the titles of windows that have monitor or bell flags  set  in  caption  or
       hardstatus  or windowlist. See the "STRING ESCAPES" chapter for the syntax of the modifiers.  The default
       for monitor is currently "=b " (bold, active colors),  for  bell  "=ub  "  (underline,  bold  and  active
       colors), and "=u " for silence.

       reset

       Reset the virtual terminal to its "power-on" values. Useful when strange settings (like scroll regions or
       graphics character set) are left over from an application.

       resize [-h|-v|-b|-l|-p] [[+|-] n[%] |=|max|min|_|0]

       Resize the current region. The space will be removed from or added to the surrounding  regions  depending
       on  the  order  of  the splits.  The available options for resizing are `-h'(horizontal), `-v'(vertical),
       `-b'(both), `-l'(local to layer), and `-p'(perpendicular). Horizontal resizes will add or remove width to
       a  region,  vertical  will  add  or remove height, and both will add or remove size from both dimensions.
       Local and perpendicular are similar to horizontal and vertical, but they take in account of how a  region
       was  split.  If a region's last split was horizontal, a local resize will work like a vertical resize. If
       a region's last split was vertical, a local resize will work  like  a  horizontal  resize.  Perpendicular
       resizes work in opposite of local resizes. If no option is specified, local is the default.

       The  amount of lines to add or remove can be expressed a couple of different ways. By specifying a number
       n by itself will resize the region by that  absolute  amount.  You  can  specify  a  relative  amount  by
       prefixing  a  plus `+' or minus `-' to the amount, such as adding +n lines or removing -n lines. Resizing
       can also be expressed as an absolute or relative percentage by postfixing a percent sign `%'. Using  zero
       `0' is a synonym for `min' and using an underscore `_' is a synonym for `max'.

       Some examples are:

       resize +N
              increase current region by N

       resize -N
              decrease current region by N

       resize  N
              set current region to N

       resize 20%
              set current region to 20% of original size

       resize +20%
              increase current region by 20%

       resize -b =
              make all windows equally

       resize  max
              maximize current region

       resize  min
              minimize current region

       Without any arguments, screen will prompt for how you would like to resize the current region.

       See "focusminsize" if you want to restrict the minimum size a region can have.

       screen [-opts] [n] [cmd [args]|//group]

       Establish  a  new  window.  The flow-control options (-f, -fn and -fa), title (a.k.a.) option (-t), login
       options (-l and -ln) , terminal type option (-T <term>),  the  all-capability-flag  (-a)  and  scrollback
       option  (-h  <num>)  may  be  specified  with each command.  The option (-M) turns monitoring on for this
       window.  The option (-L) turns output logging on for this window.  If an optional number n in  the  range
       0..MAXWIN-1  is given, the window number n is assigned to the newly created window (or, if this number is
       already in-use, the next available number).  If a command is specified after "screen", this command (with
       the  given arguments) is started in the window; otherwise, a shell is created.  If //group is supplied, a
       container-type window is created in which other windows may be created inside it.

       Thus, if your ".screenrc" contains the lines

                # example for .screenrc:
                screen 1
                screen -fn -t foobar -L 2 telnet foobar

       screen creates a shell window (in window #1) and a window with a TELNET connection to the machine  foobar
       (with  no flow-control using the title "foobar" in window #2) and will write a logfile ("screenlog.2") of
       the telnet session.  Note, that unlike previous versions  of  screen  no  additional  default  window  is
       created  when  "screen"  commands  are  included  in  your  ".screenrc"  file. When the initialization is
       completed, screen switches to the last window specified in your .screenrc  file  or,  if  none,  opens  a
       default window #0.

       Screen has built in some functionality of "cu" and "telnet".  See also chapter "WINDOW TYPES".

       scrollback num

       Set the size of the scrollback buffer for the current windows to num lines. The default scrollback is 100
       lines.  See also the "defscrollback" command and use "info" to view the current setting.  To  access  and
       use the contents in the scrollback buffer, use the "copy" command.

       select [WindowID]

       Switch to the window identified by WindowID.  This can be a prefix of a window title (alphanumeric window
       name) or a window number.  The parameter is optional and if omitted, you get prompted for an  identifier.
       When a new window is established, the first available number is assigned to this window.  Thus, the first
       window can be activated by "select 0".  The number of windows is limited at compile-time  by  the  MAXWIN
       configuration  parameter  (which  defaults  to  40).   There  are  two special WindowIDs, "-" selects the
       internal blank window and "." selects the current window. The latter is useful if used with screen's "-X"
       option.

       sessionname [name]

       Rename  the  current  session.  Note,  that  for  "screen  -list"  the  name shows up with the process-id
       prepended. If the argument "name" is omitted, the name of this session is displayed.  Caution:  The  $STY
       environment  variables  will  still  reflect  the  old  name  in  pre-existing shells. This may result in
       confusion. Use of this command is generally discouraged. Use the "-S" command-line option if you want  to
       name a new session.  The default is constructed from the tty and host names.

       setenv [var [string]]

       Set the environment variable var to value string.  If only var is specified, the user will be prompted to
       enter a value.  If no parameters are specified, the user will be prompted for both  variable  and  value.
       The environment is inherited by all subsequently forked shells.

       setsid [on|off]

       Normally screen uses different sessions and process groups for the windows. If setsid is turned off, this
       is not done anymore and all windows will be in the same process group as the screen backend process. This
       also  breaks  job-control,  so be careful.  The default is on, of course. This command is probably useful
       only in rare circumstances.

       shell command

       Set the command to be used to create a new shell.  This overrides the value of the  environment  variable
       $SHELL.   This  is  useful  if you'd like to run a tty-enhancer which is expecting to execute the program
       specified in $SHELL.  If the command begins with a '-' character, the shell will be started as  a  login-
       shell.  Typical  shells do only minimal initialization when not started as a login-shell.  E.g. Bash will
       not read your "~/.bashrc" unless it is a login-shell.

       shelltitle title

       Set the title for all shells created during startup or by the C-A C-c command.  For details about what  a
       title is, see the discussion entitled "TITLES (naming windows)".

       silence [on|off|sec]

       Toggles silence monitoring of windows.  When silence is turned on and an affected window is switched into
       the background, you will receive the silence notification message in the status line  after  a  specified
       period  of  inactivity (silence). The default timeout can be changed with the `silencewait' command or by
       specifying a number of seconds instead of `on' or `off'.  Silence is initially off for all windows.

       silencewait sec

       Define the time that all windows monitored for silence should wait before displaying a  message.  Default
       30 seconds.

       sleep num

       This  command  will  pause the execution of a .screenrc file for num seconds.  Keyboard activity will end
       the sleep.  It may be used to give users a chance to read the messages output by "echo".

       slowpaste msec

       Define the speed at which text is inserted into the current window by the paste ("C-a  ]")  command.   If
       the  slowpaste value is nonzero text is written character by character.  screen will make a pause of msec
       milliseconds after each single character write to allow the application to process its  input.  Only  use
       slowpaste if your underlying system exposes flow control problems while pasting large amounts of text.

       sort

       Sort the windows in alphabetical order of the window tiles.

       source file

       Read  and  execute commands from file file. Source commands may be nested to a maximum recursion level of
       ten. If file is not an absolute path and screen is  already  processing  a  source  command,  the  parent
       directory  of  the running source command file is used to search for the new command file before screen's
       current directory.

       Note that termcap/terminfo/termcapinfo commands only work at startup and reattach time, so they  must  be
       reached via the default screenrc files to have an effect.

       sorendition [attr[color]]

       This command is deprecated. See "rendition so" instead.

       split[-v]

       Split  the  current region into two new ones. All regions on the display are resized to make room for the
       new region. The blank window is displayed in the new region. The default is to create a horizontal split,
       putting  the  new  regions  on the top and bottom of each other. Using `-v' will create a vertical split,
       causing the new regions to appear side by side of each other.  Use the "remove" or the "only" command  to
       delete regions.  Use "focus" to toggle between regions.

       When  a  region  is  split  opposite of how it was previously split (that is, vertical then horizontal or
       horizontal then vertical), a new layer is created. The layer is used to group together the  regions  that
       are split the same. Normally, as a user, you should not see nor have to worry about layers, but they will
       affect how some commands ("focus" and "resize") behave.

       With this current implementation of screen, scrolling data will appear much slower in a vertically  split
       region  than  one that is not. This should be taken into consideration if you need to use system commands
       such as "cat" or "tail -f".

       startup_message on|off

       Select whether you want to see the copyright notice during startup.  Default is  `on',  as  you  probably
       noticed.

       status [top|up|down|bottom] [left|right]

       The  status  window  by  default  is  in bottom-left corner. This command can move status messages to any
       corner of the screen. top is the same as up, down is the same as bottom.

       stuff [string]

       Stuff the string string in the input buffer of the current window.  This is like the "paste" command  but
       with  much  less  overhead.   Without  a parameter, screen will prompt for a string to stuff.  You cannot
       paste large buffers with the "stuff" command. It is most useful for key bindings. See also "bindkey".

       su [username [password [password2]]]

       Substitute the user of a display. The command prompts for all parameters that are omitted.  If  passwords
       are  specified as parameters, they have to be specified un-crypted. The first password is matched against
       the systems passwd database, the second password is matched against the screen password as set  with  the
       commands  "acladd"  or  "password".   "Su"  may  be useful for the screen administrator to test multiuser
       setups.  When the identification fails, the user has access to the commands available  for  user  nobody.
       These are "detach", "license", "version", "help" and "displays".

       suspend

       Suspend  screen.  The windows are in the `detached' state, while screen is suspended. This feature relies
       on the shell being able to do job control.

       term term

       In each window's environment screen opens, the $TERM variable is set to "screen" by default.  But when no
       description  for "screen" is installed in the local termcap or terminfo data base, you set $TERM to - say
       - "vt100". This won't do much harm, as screen is VT100/ANSI compatible.  The use of the "term" command is
       discouraged  for  non-default  purpose.   That  is,  one may want to specify special $TERM settings (e.g.
       vt100) for the next "screen rlogin othermachine"  command.  Use  the  command  "screen  -T  vt100  rlogin
       othermachine" rather than setting and resetting the default.

       termcap term terminal-tweaks[window-tweaks]

       terminfo term terminal-tweaks[window-tweaks]

       termcapinfo term terminal-tweaks[window-tweaks]

       Use  this  command to modify your terminal's termcap entry without going through all the hassles involved
       in creating a custom termcap entry.  Plus, you can optionally customize the  termcap  generated  for  the
       windows.   You have to place these commands in one of the screenrc startup files, as they are meaningless
       once the terminal emulator is booted.

       If your system uses the terminfo database rather than termcap,  screen  will  understand  the  `terminfo'
       command,  which  has  the  same effects as the `termcap' command.  Two separate commands are provided, as
       there are subtle syntactic differences, e.g. when parameter interpolation (using `%') is  required.  Note
       that termcap names of the capabilities have to be used with the `terminfo' command.

       In many cases, where the arguments are valid in both terminfo and termcap syntax, you can use the command
       `termcapinfo', which is just a shorthand for a pair of `termcap' and `terminfo' commands  with  identical
       arguments.

       The  first  argument  specifies which terminal(s) should be affected by this definition.  You can specify
       multiple terminal names by separating them with `|'s.  Use `*' to match all terminals and `vt*' to  match
       all terminals that begin with "vt".

       Each  tweak argument contains one or more termcap defines (separated by `:'s) to be inserted at the start
       of the appropriate termcap entry, enhancing it or overriding existing values.  The first  tweak  modifies
       your  terminal's  termcap, and contains definitions that your terminal uses to perform certain functions.
       Specify a null string to leave this unchanged (e.g. '').  The second (optional) tweak  modifies  all  the
       window  termcaps,  and  should  contain  definitions  that screen understands (see the "VIRTUAL TERMINAL"
       section).

       Some examples:

              termcap xterm*  LP:hs@

       Informs screen that all terminals that begin with `xterm' have firm  auto-margins  that  allow  the  last
       position on the screen to be updated (LP), but they don't really have a status line (no 'hs' - append `@'
       to turn entries off).  Note that we assume `LP' for all terminal names that start with "vt", but only  if
       you don't specify a termcap command for that terminal.
              termcap vt*  LP

       termcap vt102|vt220  Z0=\E[?3h:Z1=\E[?3l

       Specifies  the  firm-margined `LP' capability for all terminals that begin with `vt', and the second line
       will also add the escape-sequences to switch into (Z0) and back out of (Z1)  132-character-per-line  mode
       if  this  is  a  VT102  or  VT220.  (You must specify Z0 and Z1 in your termcap to use the width-changing
       commands.)

              termcap vt100  ""  l0=PF1:l1=PF2:l2=PF3:l3=PF4

       This leaves your vt100 termcap alone and adds the function key labels to each window's termcap entry.

              termcap h19|z19  am@:im=\E@:ei=\EO  dc=\E[P

       Takes a h19 or z19 termcap and turns off auto-margins (am@) and enables the insert  mode  (im)  and  end-
       insert  (ei)  capabilities  (the  `@'  in the `im' string is after the `=', so it is part of the string).
       Having the `im' and `ei' definitions put into your terminal's termcap will cause screen to  automatically
       advertise  the  character-insert  capability  in  each  window's  termcap.  Each window will also get the
       delete-character capability (dc) added to its termcap, which screen will translate into a line-update for
       the terminal (we're pretending it doesn't support character deletion).

       If  you  would  like  to fully specify each window's termcap entry, you should instead set the $SCREENCAP
       variable prior to running screen.  See the discussion on the "VIRTUAL TERMINAL" in this manual,  and  the
       termcap(5) man page for more information on termcap definitions.

       time   [string]

       Uses  the message line to display the time of day, the host name, and the load averages over 1, 5, and 15
       minutes (if this is available on your system).  For window specific information, use "info".

       If a string is specified, it changes the format of the time report like it is described  in  the  "STRING
       ESCAPES" chapter. Screen uses a default of "%c:%s %M %d %H%? %l%?".

       title [windowtitle]

       Set  the name of the current window to windowtitle. If no name is specified, screen prompts for one. This
       command was known as `aka' in previous releases.

       unbindall

       Unbind all the bindings. This can be useful when screen is used solely for its detaching abilities,  such
       as  when  letting  a  console  application  run as a daemon. If, for some reason, it is necessary to bind
       commands after this, use 'screen -X'.

       unsetenv var

       Unset an environment variable.

       utf8 [on|off[on|off]]

       Change the encoding used in the current window. If utf8 is enabled, the strings sent to the  window  will
       be  UTF-8  encoded  and  vice versa. Omitting the parameter toggles the setting. If a second parameter is
       given, the display's encoding is also changed (this should rather be done  with  screen's  "-U"  option).
       See also "defutf8", which changes the default setting of a new window.

       vbell [on|off]

       Sets  the  visual  bell  setting for this window. Omitting the parameter toggles the setting. If vbell is
       switched on, but your terminal does not support a visual bell, a  `vbell-message'  is  displayed  in  the
       status  line  when  the bell character (^G) is received.  Visual bell support of a terminal is defined by
       the termcap variable `vb' (terminfo: 'flash').

       Per default, vbell is off, thus the audible bell is used.  See also `bell_msg'.

       vbell_msg [message]

       Sets the visual bell message. message is printed to the  status  line  if  the  window  receives  a  bell
       character  (^G),  vbell  is  set  to  "on", but the terminal does not support a visual bell.  The default
       message is "Wuff, Wuff!!".  Without a parameter, the current message is shown.

       vbellwait sec

       Define a delay in seconds after each display of screen's visual bell message. The default is 1 second.

       verbose [on|off]

       If verbose is switched on, the command name is echoed, whenever a window is created (or resurrected  from
       zombie state). Default is off.  Without a parameter, the current setting is shown.

       version

       Print the current version and the compile date in the status line.

       wall message

       Write a message to all displays. The message will appear in the terminal's status line.

       width [-w|-d] [cols [lines]]

       Toggle the window width between 80 and 132 columns or set it to cols columns if an argument is specified.
       This requires a capable terminal and the termcap entries "Z0" and "Z1".  See the  "termcap"  command  for
       more  information.  You  can  also specify a new height if you want to change both values.  The -w option
       tells screen to leave the display size unchanged and just set the window size, -d vice versa.

       windowlist [-b] [-m] [-g]

       windowlist string [string]

       windowlist title [title]

       Display all windows in a table for visual window selection.  If screen was in a window group, screen will
       back out of the group and then display the windows in that group.  If the -b option is given, screen will
       switch to the blank window before presenting the list, so that the current  window  is  also  selectable.
       The  -m  option  changes  the  order of the windows, instead of sorting by window numbers screen uses its
       internal most-recently-used list.  The -g option will show the windows inside any groups  in  that  level
       and downwards.

       The following keys are used to navigate in "windowlist":

       ─────────────────────────────────────────────────────────────────────
       k, C-p, or up      Move up one line.
       ─────────────────────────────────────────────────────────────────────
       j, C-n, or down    Move down one line.
       ─────────────────────────────────────────────────────────────────────
       C-g or escape      Exit windowlist.
       ─────────────────────────────────────────────────────────────────────
       C-a or home        Move to the first line.
       ─────────────────────────────────────────────────────────────────────
       C-e or end         Move to the last line.
       ─────────────────────────────────────────────────────────────────────
       C-u or C-d         Move one half page up or down.
       ─────────────────────────────────────────────────────────────────────
       C-b or C-f         Move one full page up or down.
       ─────────────────────────────────────────────────────────────────────
       0..9               Using the number keys, move to the selected line.
       ─────────────────────────────────────────────────────────────────────
       mouseclick         Move   to   the  selected  line.  Available  when
                          "mousetrack" is set to "on"
       ─────────────────────────────────────────────────────────────────────
       /                  Search.
       ─────────────────────────────────────────────────────────────────────
       n                  Repeat search in the forward direction.
       ─────────────────────────────────────────────────────────────────────
       N                  Repeat search in the backward direction.
       ─────────────────────────────────────────────────────────────────────
       m                  Toggle MRU.
       ─────────────────────────────────────────────────────────────────────
       g                  Toggle group nesting.
       ─────────────────────────────────────────────────────────────────────

       a                  All window view.
       ─────────────────────────────────────────────────────────────────────
       C-h or backspace   Back out the group.
       ─────────────────────────────────────────────────────────────────────
       ,                  Switch numbers with the previous window.
       ─────────────────────────────────────────────────────────────────────
       .                  Switch numbers with the next window.
       ─────────────────────────────────────────────────────────────────────
       K                  Kill that window.
       ─────────────────────────────────────────────────────────────────────
       space or enter     Select that window.
       ─────────────────────────────────────────────────────────────────────

       The table format can be changed with the string and  title  option,  the  title  is  displayed  as  table
       heading,  while  the lines are made by using the string setting. The default setting is "Num Name%=Flags"
       for the title and "%3n %t%=%f" for the lines.  See the "STRING ESCAPES"  chapter  for  more  codes  (e.g.
       color settings).

       "Windowlist"  needs  a  region  size  of  at  least  10 characters wide and 6 characters high in order to
       display.

       windows [ string ]

       Uses the message line to display a list of all the windows.  Each window is listed  by  number  with  the
       name  of  process that has been started in the window (or its title); the current window is marked with a
       `*'; the previous window is marked with a `-'; all the windows that are "logged in"  are  marked  with  a
       `$'; a background window that has received a bell is marked with a `!'; a background window that is being
       monitored and has had activity occur is marked with an `@'; a window which has output logging  turned  on
       is  marked  with  `(L)'; windows occupied by other users are marked with `&'; windows in the zombie state
       are marked with `Z'.  If this list is too long to fit on the terminal's  status  line  only  the  portion
       around  the  current  window  is  displayed.   The optional string parameter follows the "STRING ESCAPES"
       format.  If string parameter is passed, the output size is unlimited.  The default  command  without  any
       parameter is limited to a size of 1024 bytes.

       wrap [on|off]

       Sets  the  line-wrap  setting  for  the  current  window.   When  line-wrap is on, the second consecutive
       printable character output at the last column of a line will wrap to the start of the following line.  As
       an added feature, backspace (^H) will also wrap through the left margin to the previous line.  Default is
       `on'. Without any options, the state of wrap is toggled.

       writebuf [-e encoding] [filename]

       Writes the contents of the paste buffer to the specified file, or the public  accessible  screen-exchange
       file  if  no  filename  is given. This is thought of as a primitive means of communication between screen
       users on the same host. If an encoding is specified the paste buffer is recoded on the fly to  match  the
       encoding.  The filename can be set with the bufferfile command and defaults to "/tmp/screen-exchange".

       writelock [on|off|auto]

       In  addition  to access control lists, not all users may be able to write to the same window at once. Per
       default, writelock is in `auto' mode and grants exclusive input permission to the user who is  the  first
       to  switch  to  the  particular  window.  When he leaves the window, other users may obtain the writelock
       (automatically). The writelock of the current window is disabled by the command "writelock off".  If  the
       user  issues  the command "writelock on" he keeps the exclusive write permission while switching to other
       windows.

       xoff

       xon

       Insert a CTRL-s / CTRL-q character to the stdin queue of the current window.

       zmodem [off|auto|catch|pass]

       zmodem sendcmd [string]

       zmodem recvcmd [string]

       Define zmodem support for screen. Screen understands  two  different  modes  when  it  detects  a  zmodem
       request:  "pass"  and  "catch".  If the mode is set to "pass", screen will relay all data to the attacher
       until the end of the transmission is reached.  In "catch" mode screen  acts  as  a  zmodem  endpoint  and
       starts  the  corresponding  rz/sz  commands. If the mode is set to "auto", screen will use "catch" if the
       window is a tty (e.g. a serial line), otherwise it will use "pass".

       You can define the templates screen uses in "catch" mode via the second and the third form.

       Note also that this is an experimental feature.

       zombie [keys[onerror]]

       Per default screen windows are removed from the window list as soon as the windows process  (e.g.  shell)
       exits.  When  a  string of two keys is specified to the zombie command, `dead' windows will remain in the
       list.  The kill command may be used to remove such a window. Pressing the first key in  the  dead  window
       has  the  same  effect.  When  pressing  the second key, screen will attempt to resurrect the window. The
       process that was initially running  in  the  window  will  be  launched  again.  Calling  zombie  without
       parameters will clear the zombie setting, thus making windows disappear when their process exits.

       As  the  zombie-setting  is  manipulated globally for all windows, this command should probably be called
       defzombie, but it isn't.

       Optionally you can put the word "onerror" after the keys. This will cause screen to monitor  exit  status
       of  the  process running in the window. If it exits normally ('0'), the window disappears. Any other exit
       value causes the window to become a zombie.

       zombie_timeout[seconds]

       Per default screen windows are removed from the window list as soon as the windows process  (e.g.  shell)
       exits.  If  zombie  keys  are  defined  (compare with above zombie command), it is possible to also set a
       timeout when screen tries to automatically reconnect a dead screen window.

THE MESSAGE LINE

       Screen displays informational messages and other diagnostics in a  message  line.   While  this  line  is
       distributed  to  appear at the bottom of the screen, it can be defined to appear at the top of the screen
       during compilation.  If your terminal has a status line defined in its termcap, screen will use this  for
       displaying  its  messages,  otherwise  a  line  of the current screen will be temporarily overwritten and
       output will be momentarily interrupted. The message line is automatically removed  after  a  few  seconds
       delay, but it can also be removed early (on terminals without a status line) by beginning to type.

       The  message  line  facility  can be used by an application running in the current window by means of the
       ANSI Privacy message control sequence.  For instance, from within the shell, try something like:

              echo '<esc>^Hello world from window '$WINDOW'<esc>\\'

       where '<esc>' is an escape, '^' is a literal up-arrow, and '\\' turns into a single backslash.

WINDOW TYPES

       Screen provides three different window types. New windows are created with screen's screen  command  (see
       also  the entry in chapter "CUSTOMIZATION"). The first parameter to the screen command defines which type
       of window is created. The different window types are all special cases of the normal type. They have been
       added in order to allow screen to be used efficiently as a console multiplexer with 100 or more windows.

       •  The  normal  window  contains  a shell (default, if no parameter is given) or any other system command
          that could be executed from a shell (e.g.  slogin, etc...)

       •  If a tty (character special device) name (e.g. "/dev/ttya") is specified as the first parameter,  then
          the  window  is  directly  connected  to  this  device.   This window type is similar to "screen cu -l
          /dev/ttya".  Read and write access is required on the device node, an exclusive open is  attempted  on
          the  node to mark the connection line as busy.  An optional parameter is allowed consisting of a comma
          separated list of flags in the notation used by stty(1):

          <baud_rate>
                 Usually 300, 1200, 9600 or 19200. This affects transmission as well as receive speed.

          cs8 or cs7
                 Specify the transmission of eight (or seven) bits per byte.

          ixon or -ixon
                 Enables (or disables) software flow-control (CTRL-S/CTRL-Q) for sending data.

          ixoff or -ixoff
                 Enables (or disables) software flow-control for receiving data.

          istrip or -istrip
                 Clear (or keep) the eight bit in each received byte.

          You may want to specify as many of these options as applicable. Unspecified options cause the terminal
          driver  to  make up the parameter values of the connection.  These values are system dependent and may
          be in defaults or values saved from a previous connection.

          For tty windows, the info command shows some of the modem control lines in the status line. These  may
          include `RTS', `CTS', 'DTR', `DSR', `CD' and more.  This depends on the available ioctl()'s and system
          header files as well as the on the physical capabilities  of  the  serial  board.   Signals  that  are
          logical  low  (inactive)  have their name preceded by an exclamation mark (!), otherwise the signal is
          logical high (active).  Signals not supported by the hardware but available to the  ioctl()  interface
          are usually shown low.

          When  the  CLOCAL  status bit is true, the whole set of modem signals is placed inside curly braces ({
          and }).  When the CRTSCTS or TIOCSOFTCAR  bit  is  set,  the  signals  `CTS'  or  `CD'  are  shown  in
          parenthesis, respectively.

          For  tty  windows, the command break causes the Data transmission line (TxD) to go low for a specified
          period of time. This is expected to be interpreted as break signal on the other side.  No data is sent
          and no modem control line is changed when a break is issued.

       •  If  the  first  parameter  is  "//telnet",  the second parameter is expected to be a host name, and an
          optional third parameter may specify a TCP port number (default decimal 23).  Screen will connect to a
          server listening on the remote host and use the telnet protocol to communicate with that server.

       For  telnet  windows, the command info shows details about the connection in square brackets ([ and ]) at
       the end of the status line.

              b      BINARY. The connection is in binary mode.

              e      ECHO. Local echo is disabled.

              c      SGA. The connection is in `character mode' (default: `line mode').

              t      TTYPE. The terminal type has been requested by the remote  host.   Screen  sends  the  name
                     "screen" unless instructed otherwise (see also the command `term').

              w      NAWS. The remote site is notified about window size changes.

              f      LFLOW. The remote host will send flow control information.  (Ignored at the moment.)

              Additional flags for debugging are x, t and n (XDISPLOC, TSPEED and NEWENV).

              For  telnet windows, the command break sends the telnet code IAC BREAK (decimal 243) to the remote
              host.

              This window type is only available if screen was compiled with the ENABLE_TELNET option defined.

STRING ESCAPES

       Screen provides an escape mechanism to insert information like the current time  into  messages  or  file
       names.  The  escape  character  is '%' with one exception: inside of a window's hardstatus '^%' ('^E') is
       used instead.

       Here is the full list of supported escapes:

       %      the escape character itself

       E      sets %? to true if the escape character has been pressed.

       f      flags of the window, see "windows" for meanings of the various flags

       F      sets %? to true if the window has the focus

       h      hardstatus of the window

       H      hostname of the system

       n      window number

       P      sets %? to true if the current region is in copy/paste mode

       S      session name

       s      window size

       t      window title

       u      all other users on this window

       w      all window numbers and names. With '-' qualifier: up to the current window;  with  '+'  qualifier:
              starting with the window after the current one.

       W      all window numbers and names except the current one

       x      the executed command including arguments running in this windows

       X      the executed command without arguments running in this windows

       ?      the part to the next '%?' is displayed only if a '%' escape inside the part expands to a non-empty
              string

       :      else part of '%?'

       =      pad the string to the display's width (like TeX's hfill). If a number is  specified,  pad  to  the
              percentage  of  the  window's width.  A '0' qualifier tells screen to treat the number as absolute
              position.  You can specify to pad relative to the last absolute  pad  position  by  adding  a  '+'
              qualifier or to pad relative to the right margin by using '-'. The padding truncates the string if
              the specified position lies before the current position. Add the 'L' qualifier to change this.

       <      same as '%=' but just do truncation, do not fill with spaces

       >      mark the current text position for the next truncation. When screen needs  to  do  truncation,  it
              tries  to  do  it  in a way that the marked position gets moved to the specified percentage of the
              output area. (The area starts from the last absolute pad  position  and  ends  with  the  position
              specified  by the truncation operator.) The 'L' qualifier tells screen to mark the truncated parts
              with '...'.

       {      attribute/color modifier string terminated by the next "}"

       `      Substitute with the output of a 'backtick' command. The length qualifier is  misused  to  identify
              one of the commands.

       The  'c'  and  'C'  escape  may  be qualified with a '0' to make screen use zero instead of space as fill
       character. The '0' qualifier also makes the '=' escape use absolute positions. The 'n'  and  '='  escapes
       understand  a length qualifier (e.g. '%3n'), 'D' and 'M' can be prefixed with 'L' to generate long names,
       'w' and 'W' also show the window flags if 'L' is given.

       An attribute/color modifier is used to change the  attributes  or  the  color  settings.  Its  format  is
       "[attribute  modifier]  [color  description]".  The  attribute modifier must be prefixed by a change type
       indicator if it can be confused with a color description. The following change types are known:

       +      add the specified set to the current attributes

       -      remove the set from the current attributes

       !      invert the set in the current attributes

       =      change the current attributes to the specified set

       The attribute set can either be specified as a hexadecimal number  or  a  combination  of  the  following
       letters:

       d      dim
       u      underline
       b      bold
       r      reverse
       s      standout
       B      blinking

       Colors  are  coded  either  as  a hexadecimal number or two letters specifying the desired background and
       foreground color (in that order). The following colors are known:

       k      black
       r      red
       g      green
       y      yellow
       b      blue
       m      magenta
       c      cyan
       w      white
       d      default color
       .      leave color unchanged

       The capitalized versions of the letter specify bright colors. You can also use the  pseudo-color  'i'  to
       set just the brightness and leave the color unchanged.
       A  one  digit/letter  color  description  is  treated  as foreground or background color dependent on the
       current attributes: if reverse mode is set, the background color is changed  instead  of  the  foreground
       color.  If you don't like this, prefix the color with a ".". If you want the same behavior for two-letter
       color descriptions, also prefix them with a ".".
       As a special case, "%{-}" restores the attributes and colors that were set before  the  last  change  was
       made (i.e., pops one level of the color-change stack).

       Examples:

       "G"    set color to bright green

       "+b r" use bold red

       "= yd" clear all attributes, write in default color on yellow background.

       %-Lw%{= BW}%50>%n%f* %t%{-}%+Lw%<
              The  available  windows  centered  at the current window and truncated to the available width. The
              current window is displayed white on blue.  This can be used with "hardstatus alwayslastline".

       %?%F%{.R.}%?%3n %t%? [%h]%?
              The window number and title and the window's hardstatus, if one is set.  Also use a red background
              if this is the active focus. Useful for "caption string".

FLOW-CONTROL

       Each  window has a flow-control setting that determines how screen deals with the XON and XOFF characters
       (and perhaps the interrupt character).  When flow-control is turned off, screen ignores the XON and  XOFF
       characters,  which  allows the user to send them to the current program by simply typing them (useful for
       the emacs editor, for instance).  The trade-off is that it will take longer for output  from  a  "normal"
       program  to  pause in response to an XOFF.  With flow-control turned on, XON and XOFF characters are used
       to immediately pause the output of the current window.  You  can  still  send  these  characters  to  the
       current  program, but you must use the appropriate two-character screen commands (typically "C-a q" (xon)
       and "C-a s" (xoff)).  The xon/xoff commands are also useful for typing C-s and C-q past a  terminal  that
       intercepts these characters.

       Each  window  has  an initial flow-control value set with either the -f option or the "defflow" .screenrc
       command. Per default the windows are set to automatic flow-switching.  It can then be toggled between the
       three  states 'fixed on', 'fixed off' and 'automatic' interactively with the "flow" command bound to "C-a
       f".

       The automatic flow-switching mode deals with flow control using the TIOCPKT mode (like "rlogin" does). If
       the  tty  driver  does  not support TIOCPKT, screen tries to find out the right mode based on the current
       setting of the application keypad - when it is enabled, flow-control is turned off and  visa  versa.   Of
       course, you can still manipulate flow-control manually when needed.

       If  you're  running with flow-control enabled and find that pressing the interrupt key (usually C-c) does
       not interrupt the display until another  6-8  lines  have  scrolled  by,  try  running  screen  with  the
       "interrupt"  option  (add  the  "interrupt"  flag  to the "flow" command in your .screenrc, or use the -i
       command-line option).  This causes the output that screen has accumulated from the interrupted program to
       be  flushed.   One disadvantage is that the virtual terminal's memory contains the non-flushed version of
       the output, which in rare cases can cause minor inaccuracies in the output.  For example, if  you  switch
       screens  and  return, or update the screen with "C-a l" you would see the version of the output you would
       have gotten without "interrupt" being on.  Also, you might need to turn off flow-control  (or  use  auto-
       flow  mode  to  turn  it off automatically) when running a program that expects you to type the interrupt
       character as input, as it is possible to interrupt the output of the virtual terminal  to  your  physical
       terminal when flow-control is enabled.  If this happens, a simple refresh of the screen with "C-a l" will
       restore it.  Give each mode a try, and use whichever mode you find more comfortable.

TITLES (naming windows)

       You can customize each window's name in the window display (viewed with the "windows" command (C-a w)) by
       setting it with one of the title commands.  Normally the name displayed is the actual command name of the
       program created in the window.  However, it is sometimes useful to distinguish various  programs  of  the
       same name or to change the name on-the-fly to reflect the current state of the window.

       The  default  name  for all shell windows can be set with the "shelltitle" command in the .screenrc file,
       while all other windows are created with a "screen" command and thus can have their name set with the  -t
       option.   Interactively,  there  is  the  title-string escape-sequence (<esc>kname<esc>\) and the "title"
       command (C-a A).  The former can be output from  an  application  to  control  the  window's  name  under
       software  control, and the latter will prompt for a name when typed.  You can also bind pre-defined names
       to keys with the "title" command to set things quickly without prompting. Changing title by  this  escape
       sequence can be controlled by defdynamictitle and dynamictitle commands.

       Finally,  screen  has  a  shell-specific  heuristic  that  is  enabled  by  setting  the window's name to
       "search|name" and arranging to have a null title escape-sequence output as a part of  your  prompt.   The
       search  portion  specifies  an  end-of-prompt search string, while the name portion specifies the default
       shell name for the window.  If the name ends in a `:' screen will add what it believes to be the  current
       command  running  in  the  window to the end of the window's shell name (e.g. "name:cmd").  Otherwise the
       current command name supersedes the shell name while it is running.

       Here's how it works:   you  must  modify  your  shell  prompt  to  output  a  null  title-escape-sequence
       (<esc>k<esc>\) as a part of your prompt.  The last part of your prompt must be the same as the string you
       specified for the search portion of the title.  Once this is set up, screen will  use  the  title-escape-
       sequence  to clear the previous command name and get ready for the next command.  Then, when a newline is
       received from the shell, a search is made for the end of the prompt.  If found, it will  grab  the  first
       word  after  the  matched  string and use it as the command name.  If the command name begins with either
       '!', '%', or '^' screen will use the first word on the following line (if found)  in  preference  to  the
       just-found  name.  This helps csh users get better command names when using job control or history recall
       commands.

       Here's some .screenrc examples:

              screen -t top 2 nice top

       Adding this line to your .screenrc would start a nice-d version of the "top" command in  window  2  named
       "top" rather than "nice".

                       shelltitle '> |csh'
                       screen 1

       These  commands would start a shell with the given shelltitle.  The title specified is an auto-title that
       would expect the prompt and the typed command to look something like the following:

              /usr/joe/src/dir> trn

       (it looks after the '> ' for the command name).  The window status would show the name  "trn"  while  the
       command was running, and revert to "csh" upon completion.

              bind R screen -t '% |root:' su

       Having this command in your .screenrc would bind the key sequence "C-a R" to the "su" command and give it
       an auto-title name of "root:".  For this auto-title to work, the screen could look something like this:

                       % !em
                       emacs file.c

       Here the user typed the csh history command "!em" which ran the previously entered "emacs" command.   The
       window  status  would show "root:emacs" during the execution of the command, and revert to simply "root:"
       at its completion.

                       bind o title
                       bind E title ""
                       bind u title (unknown)

       The first binding doesn't have any arguments, so it would prompt you for a title when you type  "C-a  o".
       The  second binding would clear an auto-title's current setting (C-a E).  The third binding would set the
       current window's title to "(unknown)" (C-a u).

       One thing to keep in mind when adding a null title-escape-sequence to your prompt  is  that  some  shells
       (like  the  csh) count all the non-control characters as part of the prompt's length.  If these invisible
       characters aren't a multiple of 8 then backspacing over a tab will result in an incorrect  display.   One
       way to get around this is to use a prompt like this:

              set prompt='^[[0000m^[k^[\% '

       The  escape-sequence  "<esc>[0000m" not only normalizes the character attributes, but all the zeros round
       the length of the invisible characters up to 8.  Bash  users  will  probably  want  to  echo  the  escape
       sequence in the PROMPT_COMMAND:

              PROMPT_COMMAND='printf "\033k\033\134"'

       (I used "\134" to output a `\' because of a bug in bash v1.04).

THE VIRTUAL TERMINAL

       Each  window  in  a  screen session emulates a VT100 terminal, with some extra functions added. The VT100
       emulator is hard-coded, no other terminal types can be emulated.
       Usually screen tries to emulate as much of the VT100/ANSI standard as  possible.  But  if  your  terminal
       lacks  certain  capabilities,  the  emulation  may not be complete. In these cases screen has to tell the
       applications that some of the features are missing. This is no problem on machines using termcap, because
       screen can use the $TERMCAP variable to customize the standard screen termcap.

       But  if  you  do  a  rlogin  on another machine or your machine supports only terminfo this method fails.
       Because of this, screen offers a way to deal with these cases.  Here is how it works:

       When screen tries to figure out  a  terminal  name  for  itself,  it  first  looks  for  an  entry  named
       "screen.<term>",  where  <term>  is the contents of your $TERM variable.  If no such entry exists, screen
       tries "screen" (or "screen-w" if the terminal is wide (132 cols or more)).  If even this entry cannot  be
       found, "vt100" is used as a substitute.

       The  idea  is that if you have a terminal which doesn't support an important feature (e.g. delete char or
       clear to EOS) you can build a new termcap/terminfo entry for screen (named "screen.<dumbterm>") in  which
       this  capability  has  been  disabled.  If  this entry is installed on your machines you are able to do a
       rlogin and still keep the correct termcap/terminfo entry.  The terminal name is put in the $TERM variable
       of  all  new  windows.  Screen also sets the $TERMCAP variable reflecting the capabilities of the virtual
       terminal emulated. Notice that, however, on machines using the terminfo database  this  variable  has  no
       effect.  Furthermore, the variable $WINDOW is set to the window number of each window.

       The actual set of capabilities supported by the virtual terminal depends on the capabilities supported by
       the physical terminal.  If, for instance, the physical terminal does not support underscore mode,  screen
       does not put the `us' and `ue' capabilities into the window's $TERMCAP variable, accordingly.  However, a
       minimum number of capabilities must be supported by a terminal in order to run screen; namely  scrolling,
       clear  screen, and direct cursor addressing (in addition, screen does not run on hardcopy terminals or on
       terminals that over-strike).

       Also, you can customize the $TERMCAP value used by screen by using the "termcap" .screenrc command, or by
       defining  the variable $SCREENCAP prior to startup.  When the latter is defined, its value will be copied
       verbatim into each window's $TERMCAP variable.  This can either be the full  terminal  definition,  or  a
       filename where the terminal "screen" (and/or "screen-w") is defined.

       Note  that screen honors the "terminfo" .screenrc command if the system uses the terminfo database rather
       than termcap.

       When the boolean `G0' capability is present in the termcap entry for the terminal  on  which  screen  has
       been  called,  the  terminal  emulation  of  screen  supports  multiple  character  sets.  This allows an
       application to make use of, for instance, the VT100 graphics character set or  national  character  sets.
       The following control functions from ISO 2022 are supported: lock shift G0 (SI), lock shift G1 (SO), lock
       shift G2, lock shift G3, single shift G2, and single shift G3.  When a virtual  terminal  is  created  or
       reset,  the  ASCII  character  set  is designated as G0 through G3.  When the `G0' capability is present,
       screen evaluates the capabilities `S0', `E0', and `C0' if present. `S0' is the sequence the terminal uses
       to enable and start the graphics character set rather than SI.  `E0' is the corresponding replacement for
       SO. `C0' gives a character by character translation string that is used during semi-graphics  mode.  This
       string is built like the `acsc' terminfo capability.

       When  the `po' and `pf' capabilities are present in the terminal's termcap entry, applications running in
       a screen window can send output to the printer port of the terminal.  This  allows  a  user  to  have  an
       application  in one window sending output to a printer connected to the terminal, while all other windows
       are still active (the printer port is enabled and disabled again for each chunk of output).  As  a  side-
       effect,  programs  running in different windows can send output to the printer simultaneously.  Data sent
       to the printer is not displayed in the window.  The info command displays a line  starting  `PRIN'  while
       the printer is active.

       Screen  maintains a hardstatus line for every window. If a window gets selected, the display's hardstatus
       will be updated to match the window's hardstatus line. If the display has no hardstatus the line will  be
       displayed  as  a  standard  screen message.  The hardstatus line can be changed with the ANSI Application
       Program  Command  (APC):  "ESC_<string>ESC\".  As  a   convenience   for   xterm   users   the   sequence
       "ESC]0..2;<string>^G" is also accepted.

       Some  capabilities  are  only  put  into  the  $TERMCAP  variable  of the virtual terminal if they can be
       efficiently implemented by the physical terminal.  For instance, `dl' (delete line) is only put into  the
       $TERMCAP variable if the terminal supports either delete line itself or scrolling regions. Note that this
       may provoke confusion, when the session is reattached on a different terminal, as the value  of  $TERMCAP
       cannot be modified by parent processes.

       The  "alternate  screen"  capability  is  not enabled by default.  Set the altscreen .screenrc command to
       enable it.

       The following  is  a  list  of  control  sequences  recognized  by  screen.   "(V)"  and  "(A)"  indicate
       VT100-specific and ANSI- or ISO-specific functions, respectively.

       ESC E                      Next Line

       ESC D                      Index

       ESC M                      Reverse Index

       ESC H                      Horizontal Tab Set

       ESC Z                      Send VT100 Identification String

       ESC 7                 (V)  Save Cursor and Attributes

       ESC 8                 (V)  Restore Cursor and Attributes

       ESC [s                (A)  Save Cursor and Attributes

       ESC [u                (A)  Restore Cursor and Attributes

       ESC c                      Reset to Initial State

       ESC g                      Visual Bell

       ESC Pn p                   Cursor Visibility (97801)

                                  Pn = 6                     Invisible

                                  Pn = 7                     Visible

       ESC =                 (V)  Application Keypad Mode

       ESC >                 (V)  Numeric Keypad Mode

       ESC # 8               (V)  Fill Screen with E's

       ESC \                 (A)  String Terminator

       ESC ^                 (A)  Privacy Message String (Message Line)

       ESC !                      Global Message String (Message Line)

       ESC k                      A.k.a. Definition String

       ESC P                 (A)  Device Control String.  Outputs a string directly to the host terminal without
                                  interpretation.

       ESC _                 (A)  Application Program Command (Hardstatus)

       ESC ] 0 ; string ^G   (A)  Operating System Command (Hardstatus, xterm title hack)

       ESC ] 83 ; cmd ^G     (A)  Execute screen command. This only works if multi-user support is compiled into
                                  screen.  The  pseudo-user ":window:" is used to check the access control list.
                                  Use "addacl :window: -rwx #?" to create a user with no rights and  allow  only
                                  the needed commands.

       Control-N             (A)  Lock Shift G1 (SO)

       Control-O             (A)  Lock Shift G0 (SI)

       ESC n                 (A)  Lock Shift G2

       ESC o                 (A)  Lock Shift G3

       ESC N                 (A)  Single Shift G2

       ESC O                 (A)  Single Shift G3

       ESC ( Pcs             (A)  Designate character set as G0

       ESC ) Pcs             (A)  Designate character set as G1

       ESC * Pcs             (A)  Designate character set as G2

       ESC + Pcs             (A)  Designate character set as G3

       ESC [ Pn ; Pn H            Direct Cursor Addressing

       ESC [ Pn ; Pn f            same as above

       ESC [ Pn J                 Erase in Display

                                  Pn = None or 0             From Cursor to End of Screen

                                  Pn = 1                     From Beginning of Screen to Cursor

                                  Pn = 2                     Entire Screen

       ESC [ Pn K                 Erase in Line

                                  Pn = None or 0             From Cursor to End of Line

                                  Pn = 1                     From Beginning of Line to Cursor

                                  Pn = 2                     Entire Line

       ESC [ Pn X                 Erase character

       ESC [ Pn A                 Cursor Up

       ESC [ Pn B                 Cursor Down

       ESC [ Pn C                 Cursor Right

       ESC [ Pn D                 Cursor Left

       ESC [ Pn E                 Cursor next line

       ESC [ Pn F                 Cursor previous line

       ESC [ Pn G                 Cursor horizontal position

       ESC [ Pn `                 same as above

       ESC [ Pn d                 Cursor vertical position

       ESC [ Ps ;...; Ps m        Select Graphic Rendition

                                  Ps = None or 0             Default Rendition

                                  Ps = 1                     Bold

                                  Ps = 2                (A)  Faint

                                  Ps = 3                (A)  Standout Mode (ANSI: Italicized)

                                  Ps = 4                     Underlined

                                  Ps = 5                     Blinking

                                  Ps = 7                     Negative Image

                                  Ps = 22               (A)  Normal Intensity

                                  Ps = 23               (A)  Standout Mode off (ANSI: Italicized off)

                                  Ps = 24               (A)  Not Underlined

                                  Ps = 25               (A)  Not Blinking

                                  Ps = 27               (A)  Positive Image

                                  Ps = 30               (A)  Foreground Black

                                  Ps = 31               (A)  Foreground Red

                                  Ps = 32               (A)  Foreground Green

                                  Ps = 33               (A)  Foreground Yellow

                                  Ps = 34               (A)  Foreground Blue

                                  Ps = 35               (A)  Foreground Magenta

                                  Ps = 36               (A)  Foreground Cyan

                                  Ps = 37               (A)  Foreground White

                                  Ps = 39               (A)  Foreground Default

                                  Ps = 40               (A)  Background Black

                                  Ps = ...

                                  Ps = 49               (A)  Background Default

       ESC [ Pn g                 Tab Clear

                                  Pn = None or 0             Clear Tab at Current Position

                                  Pn = 3                     Clear All Tabs

       ESC [ Pn ; Pn r       (V)  Set Scrolling Region

       ESC [ Pn I            (A)  Horizontal Tab

       ESC [ Pn Z            (A)  Backward Tab

       ESC [ Pn L            (A)  Insert Line

       ESC [ Pn M            (A)  Delete Line

       ESC [ Pn @            (A)  Insert Character

       ESC [ Pn P            (A)  Delete Character

       ESC [ Pn S                 Scroll Scrolling Region Up

       ESC [ Pn T                 Scroll Scrolling Region Down

       ESC [ Pn ^                 same as above

       ESC [ Ps ;...; Ps h        Set Mode

       ESC [ Ps ;...; Ps l        Reset Mode

                                  Ps = 4                (A)  Insert Mode

                                  Ps = 20               (A)  Automatic Linefeed Mode

                                  Ps = 34                    Normal Cursor Visibility

                                  Ps = ?1               (V)  Application Cursor Keys

                                  Ps = ?3               (V)  Change Terminal Width to 132 columns

                                  Ps = ?5               (V)  Reverse Video

                                  Ps = ?6               (V)  Origin Mode

                                  Ps = ?7               (V)  Wrap Mode

                                  Ps = ?9                    X10 mouse tracking

                                  Ps = ?25              (V)  Visible Cursor

                                  Ps = ?47                   Alternate Screen (old xterm code)

                                  Ps = ?1000            (V)  VT200 mouse tracking

                                  Ps = ?1047                 Alternate Screen (new xterm code)

                                  Ps = ?1049                 Alternate Screen (new xterm code)

       ESC [ 5 i             (A)  Start relay to printer (ANSI Media Copy)

       ESC [ 4 i             (A)  Stop relay to printer (ANSI Media Copy)

       ESC [ 8 ; Ph ; Pw t        Resize the window to `Ph' lines and `Pw' columns (SunView special)

       ESC [ c                    Send VT100 Identification String

       ESC [ x                    Send Terminal Parameter Report

       ESC [ > c                  Send VT220 Secondary Device Attributes String

       ESC [ 6 n                  Send Cursor Position Report

INPUT TRANSLATION

       In  order  to  do  a full VT100 emulation screen has to detect that a sequence of characters in the input
       stream was generated by a keypress on the user's keyboard and insert the  VT100  style  escape  sequence.
       Screen has a very flexible way of doing this by making it possible to map arbitrary commands on arbitrary
       sequences of characters. For standard VT100 emulation the command will always  insert  a  string  in  the
       input  buffer  of  the  window  (see  also  command  stuff  in the command table).  Because the sequences
       generated by a keypress can change after a reattach from a different terminal type,  it  is  possible  to
       bind  commands  to  the  termcap  name  of  the  keys.  Screen will insert the correct binding after each
       reattach. See the bindkey command for further details on the syntax and examples.

       Here is the table of the default key bindings. The fourth is what command is executed if the keyboard  is
       switched into application mode.

       ┌────────────────┬──────────────┬──────────┬──────────┐
       │Key name        │ Termcap name │ Command  │ App mode │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Cursor up       │ ku           │ \033[A   │ \033OA   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Cursor down     │ kd           │ \033[B   │ \033OB   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Cursor right    │ kr           │ \033[C   │ \033OC   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Cursor left     │ kl           │ \033[D   │ \033OD   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 0  │ k0           │ \033[10~ │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 1  │ k1           │ \033OP   │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 2  │ k2           │ \033OQ   │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 3  │ k3           │ \033OR   │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 4  │ k4           │ \033OS   │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 5  │ k5           │ \033[15~ │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 6  │ k6           │ \033[17~ │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 7  │ k7           │ \033[18~ │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 8  │ k8           │ \033[19~ │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 9  │ k9           │ \033[20~ │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 10 │ k;           │ \033[21~ │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 11 │ F1           │ \033[23~ │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Function key 12 │ F2           │ \033[24~ │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Home            │ kh           │ \033[1~  │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │End             │ kH           │ \033[4~  │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Insert          │ kI           │ \033[2~  │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Delete          │ kD           │ \033[3~  │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Page up         │ kP           │ \033[5~  │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Page down       │ kN           │ \033[6~  │          │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 0        │ f0           │ 0        │ \033Op   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 1        │ f1           │ 1        │ \033Oq   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 2        │ f2           │ 2        │ \033Or   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 3        │ f3           │ 3        │ \033Os   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 4        │ f4           │ 4        │ \033Ot   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 5        │ f5           │ 5        │ \033Ou   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 6        │ f6           │ 6        │ \033Ov   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 7        │ f7           │ 7        │ \033Ow   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 8        │ f8           │ 8        │ \033Ox   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad 9        │ f9           │ 9        │ \033Oy   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad +        │ f+           │ +        │ \033Ok   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad -        │ f-           │ -        │ \033Om   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad *        │ f*           │ *        │ \033Oj   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad /        │ f/           │ /        │ \033Oo   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad =        │ fq           │ =        │ \033OX   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad .        │ f.           │ .        │ \033On   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad ,        │ f,           │ ,        │ \033Ol   │
       ├────────────────┼──────────────┼──────────┼──────────┤
       │Keypad enter    │ fe           │ \015     │ \033OM   │
       └────────────────┴──────────────┴──────────┴──────────┘

SPECIAL TERMINAL CAPABILITIES

       The  following table describes all terminal capabilities that are recognized by screen and are not in the
       termcap(5) manual.  You can place these capabilities in your termcap entries (in `/etc/termcap')  or  use
       them  with  the  commands `termcap', `terminfo' and `termcapinfo' in your screenrc files. It is often not
       possible to place these capabilities in the terminfo database.

       LP   (bool)  Terminal has VT100 style margins (`magic margins'). Note that this  capability  is  obsolete
                    because screen uses the standard 'xn' instead.

       Z0   (str)   Change width to 132 columns.

       Z1   (str)   Change width to 80 columns.

       WS   (str)   Resize  display.  This capability has the desired width and height as arguments. SunView(tm)
                    example: '\E[8;%d;%dt'.

       NF   (bool)  Terminal doesn't need flow control. Send ^S and ^Q direct to the application. Same as  'flow
                    off'. The opposite of this capability is 'nx'.

       G0   (bool)  Terminal can deal with ISO 2022 font selection sequences.

       S0   (str)   Switch charset 'G0' to the specified charset. Default is '\E(%.'.

       E0   (str)   Switch charset 'G0' back to standard charset. Default is '\E(B'.

       C0   (str)   Use the string as a conversion table for font '0'. See the 'ac' capability for more details.

       CS   (str)   Switch cursor-keys to application mode.

       CE   (str)   Switch cursor-keys back to normal mode.

       AN   (bool)  Turn on autonuke. See the 'autonuke' command for more details.

       OL   (num)   Set the output buffer limit. See the 'obuflimit' command for more details.

       KJ   (str)   Set the encoding of the terminal. See the 'encoding' command for valid encodings.

       AF   (str)   Change character foreground color in an ANSI conform way. This capability will almost always
                    be set to '\E[3%dm' ('\E[3%p1%dm' on terminfo machines).

       AB   (str)   Same as 'AF', but change background color.

       AX   (bool)  Does understand ANSI set default fg/bg color (\E[39m / \E[49m).

       XC   (str)   Describe a translation of characters to strings depending on the current font. More  details
                    follow in the next section.

       XT   (bool)  Terminal understands special xterm sequences (OSC, mouse tracking).

       C8   (bool)  Terminal needs bold to display high-intensity colors (e.g. Eterm).

       TF   (bool)  Add missing capabilities to the termcap/info entry. (Set by default).

CHARACTER TRANSLATION

       Screen  has  a  powerful  mechanism to translate characters to arbitrary strings depending on the current
       font and terminal type.  Use this feature if you want to work with a common standard character  set  (say
       ISO8851-latin1) even on terminals that scatter the more unusual characters over several national language
       font pages.

       Syntax:
           XC=<charset-mapping>{,,<charset-mapping>}
           <charset-mapping> := <designator><template>{,<mapping>}
           <mapping> := <char-to-be-mapped><template-arg>

       The things in braces may be repeated any number of times.

       A <charset-mapping> tells screen how to map characters in font <designator> ('B': Ascii,  'A':  UK,  'K':
       German,  etc.)   to  strings.  Every  <mapping>  describes  to  what  string  a  single character will be
       translated. A template mechanism is used, as most of the time the codes have a lot in common (for example
       strings  to  switch  to  and from another charset). Each occurrence of '%' in <template> gets substituted
       with the <template-arg> specified together with the character. If your strings are not  similar  at  all,
       then  use '%' as a template and place the full string in <template-arg>. A quoting mechanism was added to
       make it possible to use a real '%'. The '\' character quotes the special characters '\', '%', and ','.

       Here is an example:

           termcap hp700 'XC=B\E(K%\E(B,\304[,\326\\\\,\334]'

       This tells screen how to translate ISOlatin1 (charset 'B')  upper  case  umlaut  characters  on  a  hp700
       terminal that has a German charset. '\304' gets translated to '\E(K[\E(B' and so on.  Note that this line
       gets parsed *three* times before the internal lookup table is built, therefore a lot of quoting is needed
       to create a single '\'.

       Another  extension  was  added to allow more emulation: If a mapping translates the unquoted '%' char, it
       will be sent to the terminal whenever screen switches to the corresponding <designator>. In this  special
       case  the  template  is  assumed  to  be  just  '%' because the charset switch sequence and the character
       mappings normally haven't much in common.

       This example shows one use of the extension:

           termcap xterm 'XC=K%,%\E(B,[\304,\\\\\326,]\334'

       Here, a part of the German ('K') charset is emulated on an xterm.  If screen has to  change  to  the  'K'
       charset,  '\E(B'  will  be  sent to the terminal, i.e. the ASCII charset is used instead. The template is
       just '%', so the mapping is straightforward: '[' to '\304', '\' to '\326', and ']' to '\334'.

ENVIRONMENT

       COLUMNS        Number of columns on the terminal (overrides termcap entry).
       HOME           Directory in which to look for .screenrc.
       LINES          Number of lines on the terminal (overrides termcap entry).
       LOCKPRG        Screen lock program.
       NETHACKOPTIONS Turns on nethack option.
       PATH           Used for locating programs to run.
       SCREENCAP      For customizing a terminal's TERMCAP value.
       SCREENDIR      Alternate socket directory.
       SCREENRC       Alternate user screenrc file.
       SHELL          Default shell program for opening windows (default "/bin/sh").  See also "shell" .screenrc
                      command.
       STY            Alternate socket name.
       SYSSCREENRC    Alternate system screenrc file.
       TERM           Terminal name.
       TERMCAP        Terminal description.
       WINDOW         Window number of a window (at creation time).

FILES

       .../screen-4.?.??/etc/screenrc
       .../screen-4.?.??/etc/etcscreenrc Examples  in  the  screen  distribution  package for private and global
                                         initialization files.
       $SYSSCREENRC
       /etc/screenrc                     screen initialization commands
       $SCREENRC
       $HOME/.screenrc                   Read in after /etc/screenrc
       $SCREENDIR/S-<login>
       /run/screen/S-<login>             Socket directories (default)
       /usr/tmp/screens/S-<login>        Alternate socket directories.
       <socket directory>/.termcap       Written by the "termcap" output function
       /usr/tmp/screens/screen-exchange  or
       /tmp/screen-exchange              screen `interprocess communication buffer'
       hardcopy.[0-9]                    Screen images created by the hardcopy function
       screenlog.[0-9]                   Output log files created by the log function
       /usr/lib/terminfo/?/*             or
       /etc/termcap                      Terminal capability databases
       /run/utmp                         Login records
       $LOCKPRG                          Program that locks a terminal.

SEE ALSO

       termcap(5), utmp(5), vi(1), captoinfo(1), tic(1)

AUTHORS

       Originally created by Oliver Laumann. For a long  time  maintained  and  developed  by  Juergen  Weigert,
       Michael  Schroeder,  Micah  Cowan  and  Sadrul  Habib  Chowdhury.  Since 2015 maintained and developed by
       Amadeusz Slawinski <amade@asmblr.net> and Alexander Naumov <alexander_naumov@opensuse.org>.

COPYLEFT

       Copyright (c) 2018-2020
            Alexander Naumov <alexander_naumov@opensuse.org>
            Amadeusz Slawinski <amade@asmblr.net>
       Copyright (c) 2015-2017
            Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
            Alexander Naumov <alexander_naumov@opensuse.org>
            Amadeusz Slawinski <amade@asmblr.net>
       Copyright (c) 2010-2015
            Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
            Sadrul Habib Chowdhury <sadrul@users.sourceforge.net>
       Copyright (c) 2008, 2009
            Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
            Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
            Micah Cowan <micah@cowan.name>
            Sadrul Habib Chowdhury <sadrul@users.sourceforge.net>
       Copyright (C) 1993-2003
            Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
            Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
       Copyright (C) 1987 Oliver Laumann
       This program is free software; you can redistribute it and/or modify  it  under  the  terms  of  the  GNU
       General  Public  License  as  published  by  the  Free Software Foundation; either version 3, or (at your
       option) any later version.
       This program is distributed in the hope that it will be useful, but WITHOUT ANY  WARRANTY;  without  even
       the  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
       License for more details.
       You should have received a copy of the GNU General Public License along with this program (see  the  file
       COPYING);  if  not,  write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
       02111-1307, USA

CONTRIBUTORS

       Maarten ter Huurne <maarten@treewalker.org>,
       Jussi Kukkonen <jussi.kukkonen@intel.com>,
       Eric S. Raymond <esr@thyrsus.com>,
       Thomas Renninger <treen@suse.com>,
       Axel Beckert <abe@deuxchevaux.org>,
       Ken Beal <kbeal@amber.ssd.csd.harris.com>,
       Rudolf Koenig <rfkoenig@immd4.informatik.uni-erlangen.de>,
       Toerless Eckert <eckert@immd4.informatik.uni-erlangen.de>,
       Wayne Davison <davison@borland.com>,
       Patrick Wolfe <pat@kai.com, kailand!pat>,
       Bart Schaefer <schaefer@cse.ogi.edu>,
       Nathan Glasser <nathan@brokaw.lcs.mit.edu>,
       Larry W. Virden <lvirden@cas.org>,
       Howard Chu <hyc@hanauma.jpl.nasa.gov>,
       Tim MacKenzie <tym@dibbler.cs.monash.edu.au>,
       Markku Jarvinen <mta@{cc,cs,ee}.tut.fi>,
       Marc Boucher <marc@CAM.ORG>,
       Doug Siebert <dsiebert@isca.uiowa.edu>,
       Ken Stillson <stillson@tsfsrv.mitre.org>,
       Ian Frechett <frechett@spot.Colorado.EDU>,
       Brian Koehmstedt <bpk@gnu.ai.mit.edu>,
       Don Smith <djs6015@ultb.isc.rit.edu>,
       Frank van der Linden <vdlinden@fwi.uva.nl>,
       Martin Schweikert <schweik@cpp.ob.open.de>,
       David Vrona <dave@sashimi.lcu.com>,
       E. Tye McQueen <tye%spillman.UUCP@uunet.uu.net>,
       Matthew Green <mrg@eterna.com.au>,
       Christopher Williams <cgw@pobox.com>,
       Matt Mosley <mattm@access.digex.net>,
       Gregory Neil Shapiro <gshapiro@wpi.WPI.EDU>,
       Johannes Zellner <johannes@zellner.org>,
       Pablo Averbuj <pablo@averbuj.com>.

AVAILABILITY

       The latest official release of screen available via anonymous ftp  from  ftp.gnu.org/gnu/screen/  or  any
       other GNU distribution site. The home site of screen is savannah.gnu.org/projects/screen/. If you want to
       help, send a note to screen-devel@gnu.org.

BUGS

       •  `dm' (delete mode) and `xs' are not handled correctly (they are ignored). `xn' is treated as a  magic-
          margin indicator.

       •  Screen  has  no  clue  about  double-high  or double-wide characters.  But this is the only area where
          vttest is allowed to fail.

       •  It is not possible to change the environment variable $TERMCAP  when  reattaching  under  a  different
          terminal type.

       •  The  support  of terminfo based systems is very limited. Adding extra capabilities to $TERMCAP may not
          have any effects.

       •  Screen does not make use of hardware tabs.

       •  Screen must be installed as set-uid with owner root on most systems in order to be able  to  correctly
          change  the  owner of the tty device file for each window.  Special permission may also be required to
          write the file "/run/utmp".

       •  Entries in "/run/utmp" are not removed when screen is killed  with  SIGKILL.   This  will  cause  some
          programs (like "w" or "rwho") to advertise that a user is logged on who really isn't.

       •  Screen may give a strange warning when your tty has no utmp entry.

       •  When  the  modem  line  was  hung  up, screen may not automatically detach (or quit) unless the device
          driver is configured to send a HANGUP signal.  To detach a screen session use the  -D  or  -d  command
          line option.

       •  If a password is set, the command line options -d and -D still detach a session without asking.

       •  Both  "breaktype"  and "defbreaktype" change the break generating method used by all terminal devices.
          The first should change a window specific setting, where the latter should change only the default for
          new windows.

       •  When  attaching to a multiuser session, the user's .screenrc file is not sourced. Each user's personal
          settings have to be included in the .screenrc file from which the session is booted,  or  have  to  be
          changed manually.

       •  A weird imagination is most useful to gain full advantage of all the features.

       •  Send bug-reports, fixes, enhancements, t-shirts, money, beer & pizza to screen-devel@gnu.org.