Provided by: screen_4.0.3-7ubuntu1_i386 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.

       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.  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 "/var/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 /var/run/utmp updating).  This can
            also be defined through the "deflogin" .screenrc command.

       -ls and -list
            does not start screen, but prints a list of  pid.tty.host  strings
            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.

       -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  a  more 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  windor 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.

       -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.

       -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   attempts to resume the first 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.

       -s   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.

       -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.

       -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).

       -X   Send the specified command to a running screen  session.  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.

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:

       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 0       (select 0)
        ...           ...
       C-a 9       (select 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.

       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
       C-a C-b     (break)       Send a break to window.

       C-a B       (pow_break)   Reopen the terminal line and send a break.

       C-a c
       C-a C-c     (screen)      Create  a  new window with a shell and switch
                                 to that window.

       C-a C       (clear)       Clear the screen.

       C-a d
       C-a C-d     (detach)      Detach screen from this terminal.

       C-a D D     (pow_detach)  Detach and logout.

       C-a f
       C-a C-f     (flow)        Toggle flow on, off or auto.

       C-a F       (fit)         Resize the window to the current region size.

       C-a C-g     (vbell)       Toggles screens 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
       C-a C-i     (info)        Show info about this window.

       C-a k
       C-a C-k     (kill)        Destroy current window.

       C-a l
       C-a C-l     (redisplay)   Fully refresh current window.

       C-a L       (login)       Toggle  this  windows  login  slot. Available
                                 only if screen is configured  to  update  the
                                 utmp database.

       C-a m
       C-a C-m     (lastmsg)     Repeat  the  last  message  displayed  in the
                                 message line.

       C-a M       (monitor)     Toggles monitoring of the current window.

       C-a space
       C-a n
       C-a C-n     (next)        Switch to the next window.

       C-a N       (number)      Show the number (and title)  of  the  current
                                 window.

       C-a backspace
       C-a h
       C-a p
       C-a C-p     (prev)        Switch to the previous window (opposite of C-
                                 a n).

       C-a q
       C-a C-q     (xon)         Send a control-q to the current window.

       C-a Q       (only)        Delete all regions but the current one.

       C-a r
       C-a C-r     (wrap)        Toggle the current window’s line-wrap setting
                                 (turn  the current window’s automatic margins
                                 on and off).

       C-a s
       C-a C-s     (xoff)        Send a control-s to the current window.

       C-a S       (split)       Split the current region into two new ones.

       C-a t
       C-a C-t     (time)        Show system information.

       C-a v       (version)     Display the version and compilation date.

       C-a C-v     (digraph)     Enter digraph.

       C-a w
       C-a C-w     (windows)     Show a list of window.

       C-a W       (width)       Toggle 80/132 columns.

       C-a x
       C-a C-x     (lockscreen)  Lock this terminal.

       C-a X       (remove)      Kill the current region.

       C-a z
       C-a C-z     (suspend)     Suspend screen.   Your  system  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 C-\     (quit)        Kill all windows and terminate screen.

       C-a :       (colon)       Enter command line mode.

       C-a [
       C-a C-[
       C-a esc     (copy)        Enter copy/scrollback mode.

       C-a ]       (paste .)     Write the contents of the paste buffer to the
                                 stdin queue of the current window.

       C-a {
       C-a }       (history)     Copy and paste a previous (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 *       (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 /var/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 [-c 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 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

       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 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.

       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 windows
       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.

       clear

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

       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:
       Movement keys:
         h, j, k, l move the cursor line by line or column by column.
         0,  ^  and  $  move to the leftmost column, to the first or last non-
           whitespace character on the line.
         H, M and L move the cursor to the leftmost column of the top,  center
           or bottom line of the window.
         + and - positions one line up and down.
         G moves to the specified absolute line (default: end of buffer).
         | moves to the specified absolute column.
         w, b, e move the cursor word by word.
         B, E move the cursor WORD by WORD (as in vi).
         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.
         g moves to the beginning of the buffer.
         % jumps to the specified percentage of the buffer.

       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.

       Marking:
           The  copy range is specified by setting two marks. The text between
           these marks will be highlighted. Press
         space to set the first or second mark respectively.
         Y and y used to mark one whole line or to mark from start of line.
         W marks exactly one word.
       Repeat count:
           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.
       Searching:
         / Vi-like search forward.
         ? Vi-like search backward.
         C-a s Emacs style incremental search forward.
         C-r Emacs style reverse i-search.
       Specials:
           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  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  exchanges  the first mark and the current cursor position. You can
           use this to adjust an already placed mark.
         @ 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 dependant, 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.

       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’.

       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 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.

       defzombie [keys]

       Synonym  to the zombie command. Both currently change the default.  See
       there.

       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.

       digraph [preset]

       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.

       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.

       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,
       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  filedescriptor  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 [up|down|top|bottom]

       Move the input focus to the next region. This is done in a  cyclic  way
       so  that  the  top  region  is  selected  after  the  bottom one. If no
       subcommand is given it defaults to ‘down’. ‘up’ cycles in the  opposite
       order, ‘top’ and ‘bottom’ go to the top and bottom region respectively.
       Useful bindings are (j and k as in vi)
           bind j focus down
           bind k focus up
           bind t focus top
           bind b focus bottom

       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.

       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]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). If the type "lastline" is used, screen will
       reserve the last line of the display for the hardstatus. "message" uses
       screens  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 [-c 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
       (ot  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’.

       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.

       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 logfiles 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 [timo]

       Set the inter-character timer for input sequence detection to a timeout
       of  timo 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 may only be decreased.

       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.

       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 windows 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.

       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 [-e 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 [-e encoding] [register [filename]]

       Does one of two things, dependent on number of arguments: with zero  or
       one  arguments  it  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 [-e encoding] 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".

       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

       Resize  the  current region. The space will be removed from or added to
       the region below or if there’s not enough space from the region  above.

              resize +N   increase current region height by N

              resize -N   decrease current region height by N

              resize  N   set current region height to N

              resize  =   make all windows equally high

              resize  max maximize current region height

              resize  min minimize current region height

       screen [-opts] [n] [cmd [args]]

       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.
       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 "C-a i" to view the current setting.

       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 in
       Debian).  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:  Among  other
       problems,  the  $STY  environment variable still reflects the old name.
       Use of this command is strongly discouraged. Use the  "-S"  commandline
       option  if  you need this feature.  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.

       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.

       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]]

       Change the way screen does highlighting for text marking  and  printing
       messages.   See  the  "STRING  ESCAPES"  chapter  for the syntax of the
       modifiers.   The  default  is  currently  "=s  dd"  (standout,  default
       colors).

       split

       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  on the new region. Use the "remove" or the "only" command to
       delete regions.

       startup_message on|off

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

       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.   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  works 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.

       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 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 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]
       windowlist string [string]
       windowlist title [title]

       Display all windows in a table for visual window selection. The desired
       window can be selected via the standard movement keys (see  the  "copy"
       command)  and activated via the return key.  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  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).

       windows

       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.

       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’.

       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]
       defzombie [keys]

       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  only  be called defzombie. Until we need this as a per
       window setting, the commands zombie and defzombie are synonymous.

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
          dependant 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
          BUILTIN_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

       a      either ’am’ or ’pm’

       A      either ’AM’ or ’PM’

       c      current time HH:MM in 24h format

       C      current time HH:MM in 12h format

       d      day number

       D      weekday name

       f      flags of the window

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

       h      hardstatus of the window

       H      hostname of the system

       l      current load of the system

       m      month number

       M      month name

       n      window number

       s      seconds

       t      window title

       u      all other users on this window

       w      all  window  numbers  and  names. With ’-’ quailifier: 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

       y      last two digits of the year number

       Y      full year number

       ?      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 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 desciption. 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  dependant 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 behaviour 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.

       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=’echo -n -e "\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 is latter 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

                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

                  1               From Beginning of Screen to Cursor

                  2               Entire Screen

       ESC [ Pn K                 Erase in Line

             Pn = None or 0       From Cursor to End of Line

                  1               From Beginning of Line to Cursor

                  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

                  1               Bold

                  2          (A)  Faint

                  3          (A)  Standout Mode (ANSI: Italicized)

                  4               Underlined

                  5               Blinking

                  7               Negative Image

                  22         (A)  Normal Intensity

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

                  24         (A)  Not Underlined

                  25         (A)  Not Blinking

                  27         (A)  Positive Image

                  30         (A)  Foreground Black

                  31         (A)  Foreground Red

                  32         (A)  Foreground Green

                  33         (A)  Foreground Yellow

                  34         (A)  Foreground Blue

                  35         (A)  Foreground Magenta

                  36         (A)  Foreground Cyan

                  37         (A)  Foreground White

                  39         (A)  Foreground Default

                  40         (A)  Background Black

                  ...

                  49         (A)  Background Default

       ESC [ Pn g                 Tab Clear

             Pn = None or 0       Clear Tab at Current Position

                  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

                  20         (A)  Automatic Linefeed Mode

                  34              Normal Cursor Visibility

                  ?1         (V)  Application Cursor Keys

                  ?3         (V)  Change Terminal Width to 132 columns

                  ?5         (V)  Reverse Video

                  ?6         (V)  Origin Mode

                  ?7         (V)  Wrap Mode

                  ?9              X10 mouse tracking

                  ?25        (V)  Visible Cursor

                  ?47             Alternate Screen (old xterm code)

                  ?1000      (V)  VT200 mouse tracking

                  ?1047           Alternate Screen (new xterm code)

                  ?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. (A) means that the
       command is executed if the keyboard is switched into application  mode.

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

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").
       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>
       /var/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
       /var/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, this latest version was  produced
       by Wayne Davison, Juergen Weigert and Michael Schroeder.

COPYLEFT

       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 2, 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

       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).

VERSION

       This is version 4.0.2. Its roots are a merge of a custom version 2.3PR7
       by  Wayne  Davison and several enhancements to Oliver Laumann’s version
       2.0. Note that all  versions  numbered  2.x  are  copyright  by  Oliver
       Laumann.

AVAILABILITY

       The  latest official release of screen available via anonymous ftp from
       gnudist.gnu.org, nic.funet.fi or any other GNU distribution  site.  The
       home   site   of   screen  is  ftp.uni-erlangen.de,  in  the  directory
       pub/utilities/screen. The subdirectory ‘private’  contains  the  latest
       beta  testing  release. If you want to help, send a note to screen@uni-
       erlangen.de.

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 "/var/run/utmp".

       ·  Entries  in  "/var/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@uni-erlangen.de.