Provided by: c3270_3.3.10ga4-2build2_amd64 bug


       c3270 - curses-based IBM host access tool


       c3270 [options] [host]

       c3270 [options] session-file.c3270


       c3270  opens  a  telnet connection to an IBM host in a console window.  It implements RFCs
       2355 (TN3270E), 1576 (TN3270) and 1646 (LU name selection),  and  supports  IND$FILE  file
       transfer.   If  the  console  is  capable of displaying colors, then c3270 emulates an IBM
       3279.  Otherwise, it emulates a 3278.

       The full syntax for host is:

       Prepending a P: onto hostname causes the connection  to  go  through  the  telnet-passthru
       service rather than directly to the host.  See PASSTHRU below.

       Prepending  an  S: onto hostname removes the "extended data stream" option reported to the
       host.  See -tn below for further information.

       Prepending an N: onto hostname turns off TN3270E support for the session.

       Prepending an L: onto hostname causes c3270 to first create an SSL tunnel to the host, and
       then create a TN3270 session inside the tunnel.  (This function is supported only if c3270
       was built with SSL/TLS support).  Note that TLS-encrypted sessions using the TELNET START-
       TLS  option  are  negotiated with the host automatically; for these sessions the L: prefix
       should not be used.

       A specific Logical Unit (LU) name to use may be specified by prepending it to the hostname
       with  an  `@'.   Multiple  LU names to try can be separated by commas.  An empty LU can be
       placed in the list with an extra comma.  (Note that the LU  name  is  used  for  different
       purposes  by different kinds of hosts.  For example, CICS uses the LU name as the Terminal

       The hostname may optionally be placed inside square-bracket characters `[' and `]'.   This
       will prevent any colon `:' characters in the hostname from being interpreted as indicating
       option prefixes or port numbers.  This  allows  numeric  IPv6  addresses  to  be  used  as

       On systems that support the forkpty library call, the hostname may be replaced with -e and
       a command string.  This will cause c3270 to connect to a local child process,  such  as  a

       The  port to connect to defaults to telnet.  This can be overridden with the -port option,
       or by appending a port to the hostname with a colon `:'.  (For compatability with previous
       versions of c3270 and with tn3270(1), the port may also be specified as a second, separate


        c3270 understands the following options:

              Forces all characters to be displayed in bold.  This helps with PC  consoles  which
              display non-bold characters in unreadably dim colors.  All-bold mode is the default
              for color displays, but not for monochrome displays.

       -altscreen rowsxcols=init_string
              Defines the dimensions and escape sequence for the  alternate  (132-column)  screen
              mode.  See SCREEN SIZE SWITCHING, below.

              Causes  c3270  to operate in cbreak mode, instead of raw mode.  In cbreak mode, the
              TTY driver will properly process XOFF and XON characters,  which  are  required  by
              some  terminals  for  proper  operation.  However, those characters (usually ^S and
              ^Q), as well as the characters for interrupt, quit, and lnext (usually ^C,  ^\  and
              ^V  respectively)  will  be  seen by c3270 only if preceded by the lnext character.
              The susp character (usually ^Z) cannot be seen by c3270 at all.

       -charset name
              Specifies an EBCDIC host character set.

       -clear toggle
              Sets the initial value of toggle to false.  The  list  of  toggle  names  is  under
              TOGGLES below.

       -defscreen rowsxcols=init_string
              Defines the dimensions and escape sequence for the default (80-column) screen mode.
              See SCREEN SIZE SWITCHING, below.

       -hostsfile file
              Uses file as the hosts file, which allows aliases for host names and scripts to  be
              executed at login.  See ibm_hosts(1) for details.

       -im method
              Specifies  the  name  of  the input method to use for multi-byte input.  (Supported
              only when c3270 is compiled with DBCS support.)

       -keymap name
              Specifies a keyboard map to be found in the resource or the  file
              name.  See KEYMAPS below for details.

       -km name
              Specifies  the local encoding method for multi-byte text.  name is an encoding name
              recognized by the ICU library.  (Supported only when c3270 is  compiled  with  DBCS
              support, and necessary only when c3270 cannot figure it out from the locale.)

       -model name
              The  model  of 3270 display to be emulated.  The model name is in two parts, either
              of which may be omitted:

              The first part is the base model, which is either 3278 or 3279.  3278  specifies  a
              monochrome (green on black) 3270 display; 3279 specifies a color 3270 display.

              The  second  part  is  the  model  number,  which  specifies the number of rows and
              columns.  Model 4 is the default.

                                     Model Number   Columns   Rows
                                          2           80       24
                                          3           80       32
                                          4           80       43
                                          5           132      27

              Note: Technically, there is no such 3270 display as a 3279-4 or  3279-5,  but  most
              hosts seem to work with them anyway.

              The  default  model for a color display is 3279-4.  For a monochrome display, it is

       -mono  Prevents c3270 from using color, ignoring any color capabilities  reported  by  the

              Disables command-prompt mode.

       -oversize colsxrows
              Makes  the screen larger than the default for the chosen model number.  This option
              has effect only in combination with extended data stream support (controlled by the
              "c3270.extended"  resource),  and  only  if  the  host  supports  the  Query  Reply
              structured field.  The number of columns multiplied by the number of rows must  not
              exceed 16383 (3fff hex), the limit of 14-bit 3270 buffer addressing.

              It can also be specified as auto, which causes c3270 to fill the entire terminal or
              console window.

       -port n
              Specifies a different TCP port to connect to.  n can be a name  from  /etc/services
              like telnet, or a number.  This option changes the default port number used for all
              connections.  (The positional parameter affects only the initial connection.)

       -proxy type:host[:port]
              Causes c3270 to connect  via  the  specified  proxy,  instead  of  using  a  direct
              connection.  The host can be an IP address or hostname.  The optional port can be a
              number or a service name.  For a list of supported proxy types, see PROXY below.

       -printerlu luname
              Causes c3270 to automatically start a pr3287 printer session.  If  luname  is  ".",
              then  the  printer session will be associated with the interactive terminal session
              (this requires that the host support TN3270E).  Otherwise, the value is used as the
              explicit LU name to associate with the printer session.

              Causes  c3270  to automatically reconnect to the host if it ever disconnects.  This
              option has effect only if a hostname is specified on the command line.

       -rv    Switches c3270 from a white-on-black display to a black-on-white display.

       -scriptport port
              Causes c3270 to listen for scripting connections on local TCP port port.

              Disables the interactive c3270> prompt.  When used, a hostname must be provided  on
              the command line.

       -set toggle
              Sets  the  initial  value  of  toggle  to  true.  The list of toggle names is under
              TOGGLES below.

              Causes the emulator to create a Unix-domain socket  when  it  starts,  for  use  by
              script   processes  to  send  commands  to  the  emulator.   The  socket  is  named
              /tmp/x3sck.process_id.  The -p option of x3270if causes  it  to  use  this  socket,
              instead of pipes specified by environment variables.

       -tn name
              Specifies  the  terminal  name  to  be transmitted over the telnet connection.  The
              default name is IBM-model_name-E, for example, IBM-3279-4-E for a color display, or
              IBM-3278-4-E for a monochrome display.

              Some  hosts are confused by the -E suffix on the terminal name, and will ignore the
              extra screen area on models 3, 4 and 5.  Prepending  an  s:  on  the  hostname,  or
              setting  the "c3270.extended" resource to "false", removes the -E from the terminal
              name when connecting to such hosts.

              The name can also be specified with the "c3270.termName" resource.

       -trace Turns on data stream and event tracing at startup.  The default trace file name  is

       -tracefile file
              Specifies a file to save data stream and event traces into.

       -tracefilesize size
              Places a limit on the size of a trace file.  If this option is not specified, or is
              specified as 0 or none, the trace file will be unlimited.  If specified, the  trace
              file  cannot  already exist, and the (silently enforced) minimum size is 64 Kbytes.
              The value of size can have a K or  M  suffix,  indicating  kilobytes  or  megabytes

       -v     Display the version and build options for c3270 and exit.

       -xrm "c3270.resource: value"
              Sets the value of the named resource to value.  Resources control less common c3270
              options, and are defined under RESOURCES below.

       These names are also used as the first parameter to the Toggle action.


       If the terminal that c3270 is running on has at least one more row  that  the  3270  model
       requires  (e.g.,  25  rows  for  a  model 2), c3270 will display a status line.  The c3270
       status line contains a variety of information.  From left to right, the fields are:

       comm status
              The first symbol is always a 4.  If c3270 is in TN3270E mode, the second symbol  is
              a  B; otherwise it is an A.  If c3270 is in SSCP-LU mode, the third symbol is an S.
              Otherwise it is blank.

       keyboard lock
              If the keyboard is locked, an "X" symbol and a message field  indicate  the  reason
              for the keyboard lock.

              The letter "T" indicates that one or more keystrokes are in the typeahead buffer.

       temporary keymap
              The letter "K" indicates that a temporary keymap is in effect.

              The letter "R" indicates that the keyboard is in reverse field entry mode.

       insert mode
              The letter "I" indicates that the keyboard is in insert mode.

       printer session
              The letter "P" indicates that a pr3287 session is active.

       secure connection
              A green letter "S" indicates that the connection is secured via SSL/TLS.

       LU name
              The LU name associated with the session, if there is one.

       cursor position
              The cursor row and column are optionally displayed, separated by a "/".


       Here  is a complete list of basic c3270 actions.  Script-specific actions are described on
       the x3270-script(1) manual page.

       Actions marked with an asterisk (*) may block, sending  data  to  the  host  and  possibly
       waiting for a response.

                    *Attn                            attention key
                    BackSpace                        move cursor left (or send
                                                     ASCII BS)
                    BackTab                          tab to start of previous input
                    CircumNot                        input "^" in NVT mode, or
                                                     "notsign" in 3270 mode
                    *Clear                           clear screen
                    Compose                          next two keys form a special
                    *Connect(host)                   connect to host
                    *CursorSelect                    Cursor Select AID

                    Delete                           delete character under cursor
                                                     (or send ASCII DEL)
                    DeleteField                      delete the entire field
                    DeleteWord                       delete the current or previous
                    *Disconnect                      disconnect from host
                    Down                             move cursor down
                    Dup                              duplicate field
                    *Enter                           Enter AID (or send ASCII CR)
                    Erase                            erase previous character (or
                                                     send ASCII BS)
                    EraseEOF                         erase to end of current field
                    EraseInput                       erase all input fields
                    Escape                           escape to c3270> prompt
                    Execute(cmd)                     execute a command in a shell
                    FieldEnd                         move cursor to end of field
                    FieldMark                        mark field
                    HexString(hex_digits)            insert control-character
                    Home                             move cursor to first input
                    Insert                           set insert mode
                    *Interrupt                       send TELNET IP to host
                    Key(keysym)                      insert key keysym
                    Key(0xxx)                        insert key with character code
                    Left                             move cursor left
                    Left2                            move cursor left 2 positions
                    MonoCase                         toggle uppercase-only mode
                    MoveCursor(row, col)             move cursor to (row,col)
                    Newline                          move cursor to first field on
                                                     next line (or send ASCII LF)
                    NextWord                         move cursor to next word
                    *PA(n)                           Program Attention AID (n from
                                                     1 to 3)
                    *PF(n)                           Program Function AID (n from 1
                                                     to 24)
                    PreviousWord                     move cursor to previous word
                    Printer(Start[,lu]|Stop)         start or stop printer session
                    PrintText(command)               print screen text on printer
                    Quit                             exit c3270
                    Redraw                           redraw window
                    Reset                            reset locked keyboard
                    Right                            move cursor right
                    Right2                           move cursor right 2 positions
                    *Script(command[,arg...])        run a script
                    *String(string)                  insert string (simple macro
                    *SysReq                          System Request AID
                    Tab                              move cursor to next input
                    Toggle(option[,set|clear])       toggle an option
                    ToggleInsert                     toggle insert mode
                    ToggleReverse                    toggle reverse-input mode
                    *Transfer(option=value...)       file transfer
                    Up                               move cursor up
                    ignore                           do nothing

       Any of the above actions may be entered at the c3270>  prompt;  these  commands  are  also
       available  for  use  in  keymaps  (see  KEYMAPS).   Command  names  are  case-insensitive.
       Parameters can be specified with parentheses and commas, e.g.:
       or with spaces, e.g.:
              PF 1
       Parameters can be quoted with  double-quote  characters,  to  allow  spaces,  commas,  and
       parentheses to be used.

       c3270 also supports the following interactive commands:

       Help   Displays a list of available commands.

       Show   Displays statistics and settings.

       Trace  Turns  tracing  on  or  off.  The command trace on enables data stream and keyboard
              event tracing; the command trace off disables it.  The qualifier data  or  keyboard
              can  be  specified before on or off to enable or disable a particular trace.  After
              on, a filename may be  specified  to  override  the  default  trace  file  name  of


       The -keymap option or the c3270.keymap resource allow a custom keymap to be specified.  If
       the option -keymap xxx is given (or the c3270.keymap resource has the  value  xxx),  c3270
       will  look  for a resource named  If no resource definition is found, it
       will look for a file named xxx.

       Multiple keymaps may be specified be separating their names with commas.   Definitions  in
       later keymaps supercede those in earlier keymaps.

       In  addition,  separate  keymaps  may be defined that apply only in 3270 mode or NVT mode.
       For example, the resource definition or the file xxx.nvt will augment
       the   definition   of  keymap  xxx  in  NVT  mode.   Similarly,  the  resource  definition or the file xxx.3270 will augment the definition of  keymap  xxx  in
       3270 mode.

       Each  line  (rule)  in  a  keymap  specifies  actions  to perform when a particular key or
       sequence of keys is pressed.  Keymap rules have the following syntax:

              [Meta][Ctrl]<Key>key...: action[(param[,...])] ...

       Here is a sample keymap definition from a file:

              ! Lines beginning with ! are ignored and can
              ! occur anywhere.
              ! Definition of keymap xxx
              !  When Alt-c is pressed, clear the screen.
              Alt<Key>c: Clear()
              !  When PageUp is pressed, send PF7 to the host.
              <Key>PPAGE: PF(7)
              !  When Ctrl-a is pressed, then F1, send PF13
              !  to the host.
              Ctrl<Key>a <Key>F1: PF(13)

       Here is the same definition as a resource:

              ! Lines beginning with ! are ignored, but NOT
              ! within a definition.
              ! Note that the \ is required at the end of the
              ! first line, and \n\ is
              ! required at the end of every other line except
              ! the last.
              ! Definition of keymap xxx
               Alt<Key>c: Clear() \n\
               <Key>PPAGE: PF(7) \n\
               Ctrl<Key>A <Key>F1: PF(13)

       The optional Alt or Ctrl modifiers specify that the Alt and Ctrl keys  are  pressed  along
       with  the  specified  key, respectively.  Key is either an ISO 8859-1 symbol name, such as
       equal for `=' and a for `a', or a symbolic ncurses key name, such as UP.   More  than  one
       key  can be specified, indicating that a sequence of keys must be pressed in order for the
       rule to be matched.  The action is an action from the ACTIONS list above.  More  than  one
       action may be specified; they will be executed in order.

       Keymap entries are case-sensitive and modifier-specific.  This means that a keymap for the
       b key will match only a lowercase b.  Actions for uppercase B, or for Alt-b or  Control-B,
       must be specified separately.

       The base keymap is:

       Key                     Action
       Ctrl<Key>]              Escape
       Ctrl<Key>a Ctrl<Key>a   Key(0x01)
       Ctrl<Key>a Ctrl<Key>]   Key(0x1d)
       Ctrl<Key>a <Key>Tab     BackTab
       Ctrl<Key>a <Key>c       Clear
       Ctrl<Key>a <Key>e       Escape
       Ctrl<Key>a <Key>r       Reset
       Ctrl<Key>a <Key>l       Redraw
       Ctrl<Key>a <Key>m       Compose
       Ctrl<Key>a <Key>^       Key(notsign)
       <Key>UP                 Up
       <Key>DOWN               Down
       <Key>LEFT               Left
       <Key>RIGHT              Right
       <Key>F(n)               PF(n)
       Ctrl<Key>a <Key>F(n)    PF(n+12)
       Ctrl<Key>a <Key>1       PA(1)
       Ctrl<Key>a <Key>2       PA(2)
       Ctrl<Key>a <Key>3       PA(3)

       The base 3270-mode keymap adds:

       Key              Action
       Ctrl<Key>c       Clear
       Ctrl<Key>d       Dup
       Ctrl<Key>f       FieldMark
       Ctrl<Key>i       Tab
       Ctrl<Key>l       Redraw
       Ctrl<Key>r       Reset
       Ctrl<Key>u       DeleteField
       <Key>BackSpace   BackSpace
       <Key>Return      Enter
       <Key>Tab         Tab
       <Key>Linefeed    Newline
       <Key>BACKSPACE   BackSpace
       <Key>DC          Delete
       <Key>HOME        Home
       <Key>IC          ToggleInsert


       Some keyboards do not have a Meta key.  Instead, they have an Alt key.  Sometimes this key
       acts as a proper Meta key, that is, it is a modifier key  that  sets  the  high-order  bit
       (0x80) in the code that is transmitted for each key.  Other keyboards send a two-character
       sequence when the Alt key is pressed  with  another  key:  the  Escape  character  (0x1b),
       followed by the code for the other key.

       The  resource  c3270.metaEscape  and  the  termcap  km  attribute  control  how c3270 will
       interpret these sequences.  When c3270.metaEscape is set to true, or when c3270.metaEscape
       is  set  to  auto  and  the termcap km attribute is set, the keyboard is assumed to have a
       separate Meta key.  The Escape key can be used as an ordinary data key and has no  special

       When  c3270.metaEscape  is  set  to  true, or when c3270.metaEscape is set to auto and the
       termcap km attribute is not set, the keyboard is assumed to use the Escape character as  a
       prefix  to  indicate  that  the following character is supposed to have the high-order bit
       set.  When c3270 sees an Escape character from the keyboard, it sets a short timeout.   If
       another  character  arrives  before  the  timeout expires, then c3270 will combine the two
       characters, setting the high-order bit of  the  second.   In  an  event  trace  file,  the
       combined  character is listed as derived.  In a keymap, only the combined character or the
       Meta prefix may be used.  The Escape key can still be used by itself, but only if there is
       a short pause before pressing another key.

       The default value for c3270.metaEscape is auto.


       The  Transfer  action  implements  IND$FILE  file transfer.  This action requires that the
       IND$FILE program be installed on the IBM host, and that the 3270 cursor be  located  in  a
       field that will accept a TSO or VM/CMS command.

       The  Transfer  action  can be entered at the command prompt with no parameters, which will
       cause it to prompt interactively for the file names and options.  It can also  be  invoked
       with parameters to define the entire transfer.

       Because  of  the complexity and number of options for file transfer, the parameters to the
       Transfer action take the unique form of option=value, and can appear in any  order.   Note
       that  if the value contains spaces (such as a VM/CMS file name), then the entire parameter
       must be quoted, e.g., "HostFile=xxx foo a".  The options are:

       Option           Required?   Default   Other Values
       Direction           No       receive   send
       HostFile            Yes
       LocalFile           Yes
       Host                No       tso       vm
       Mode                No       ascii     binary
       Cr                  No       remove    add, keep
       Remap               No       yes       no
       Exist               No       keep      replace, append
       Recfm               No                 fixed, variable,
       Lrecl               No
       Blksize             No
       Allocation          No                 tracks, cylinders,
       PrimarySpace        No
       SecondarySpace      No
       BufferSize          No       4096

       The option details are as follows.

              send to send a file to the host, receive to receive a file from the host.

              The name of the file on the host.

              The name of the file on the local workstation.

       Host   The type of host (which dictates the  form  of  the  IND$FILE  command):  tso  (the
              default) or vm.

       Mode   Use  ascii  (the  default) for a text file, which will be translated between EBCDIC
              and ASCII as necessary.  Use binary for non-text files.

       Cr     Controls how Newline characters are handled  when  transferring  Mode=ascii  files.
              remove  (the  default) strips Newline characters in local files before transferring
              them to the host.  add adds Newline characters to  each  host  file  record  before
              transferring  it  to the local workstation.  keep preserves Newline characters when
              transferring a local file to the host.

       Remap  Controls text translation for Mode=ascii files.  The value yes (the default) causes
              c3270  to  remap the text to ensure maximum compatibility between the workstation's
              character set and encoding and the host's EBCDIC code page.  The  value  no  causes
              c3270  to  pass  the text to or from the host as-is, leaving all translation to the
              IND$FILE program on the host.

       Exist  Controls what happens when the destination file already exists.  keep (the default)
              preserves  the  file,  causing the Transfer action to fail.  replace overwrites the
              destination file with the source file.  append  appends  the  source  file  to  the
              destination file.

       Recfm  Controls the record format of files created on the host.  fixed creates a file with
              fixed-length records.   variable  creates  a  file  with  variable-length  records.
              undefined creates a file with undefined-length records (TSO hosts only).  The Lrecl
              option controls the record length or maximum  record  length  for  Recfm=fixed  and
              Recfm=variable files, respectively.

       Lrecl  Specifies  the  record  length  (or maximum record length) for files created on the

              Specifies the block size for files created on the host.  (TSO hosts only.)

              Specifies the units for the  TSO  host  PrimarySpace  and  SecondarySpace  options:
              tracks, cylinders or avblock.

              Primary  allocation  for  a file created on a TSO host.  The units are given by the
              Allocation option.

              Secondary allocation for a file created on a TSO host.  The units are given by  the
              Allocation option.

              Buffer  size  for  DFT-mode transfers.  Can range from 256 to 32768.  Larger values
              give better performance, but some hosts may not be able to support them.


       The PrintText produces screen snapshots in a number of different forms.  The default  form
       wth  no arguments sends a copy of the screen to the default printer.  A single argument is
       the command to use to print, e.g.,  lpr.   Multiple  arguments  can  include  keywords  to
       control the output of PrintText:

       file filename
              Save the output in a file.

       html   Save the output as HTML.  This option implies file.

       rtf    Save  the  output  as  RichText.   This  option implies file.  The font defaults to
              Courier New and the point size defaults to 8.   These  can  be  overridden  by  the
              printTextFont and printTextSize resources, respectively.

       string Return the output as a string.  This can only be used from scripts.

       modi   Render modified fields in italics.

       caption text
              Add  the  specified  text  as a caption above the output.  Within text, the special
              sequence %T% will be replaced with a timestamp.

       command command
              Directs the output to a command.  This allows one or more of the other keywords  to
              be specified, while still sending the output to the printer.


       There are several types of script functions available.

       The String Action
              The simplest method for scripting is provided via the String action.  The arguments
              to String are one or more double-quoted strings which are inserted directly  as  if
              typed.  The C backslash conventions are honored as follows.  (Entries marked * mean
              that after sending the AID code to the host, c3270 will wait for the host to unlock
              the keyboard before further processing the string.)

              \b       Left
              \exxxx   EBCDIC character in hex
              \f       Clear*
              \n       Enter*
              \pan     PA(n)*
              \pfnn    PF(nn)*
              \r       Newline
              \t       Tab
              \T       BackTab

              \uxxxx   Unicode character in hex
              \xxxxx   Unicode character in hex

              Note  that the numeric values for the \e, \u and \x sequences can be abbreviated to
              2 digits.  Note also that EBCDIC codes greater than 255 and some Unicode  character
              codes  represent  DBCS characters, which will work only if c3270 is built with DBCS
              support and the host allows DBCS input in the current field.

              An example keymap entry would be:
              Meta<Key>p: String("probs clearrdr\n")

              Note: The strings are in ASCII and converted to  EBCDIC,  so  beware  of  inserting
              control codes.

              There  is  also an alternate form of the String action, HexString, which is used to
              enter non-printing data.  The argument to HexString  is  a  string  of  hexadecimal
              digits,  two  per  character.   A  leading 0x or 0X is optional.  In 3270 mode, the
              hexadecimal data represent EBCDIC characters, which are entered  into  the  current
              field.   In  NVT  mode,  the hexadecimal data represent ASCII characters, which are
              sent directly to the host.

       The Script Action
              This action causes c3270 to start a child process which can execute c3270  actions.
              Standard  input  and  output  from  the child process are piped back to c3270.  The
              Script action is fully documented in x3270-script(1).


       c3270 allows the direct entry of accented  letters  and  special  symbols.   Pressing  and
       releasing  the  "Compose"  key,  followed  by  two  other keys, causes entry of the symbol
       combining those two keys.  For example, "Compose" followed by the  "C"  key  and  the  ","
       (comma)  key,  enters  the "C-cedilla" symbol.  A C on the status line indicates a pending
       composite character.

       The mappings between these pairs of ordinary  keys  and  the  symbols  they  represent  is
       controlled  by  the "c3270.composeMap" resource; it gives the name of the map to use.  The
       maps themselves are named "".  The default is "latin1",  which  gives
       mappings  for  most of the symbols in the ISO 8859-1 Latin-1 character set that are not in
       the 7-bit ASCII character set.

       Note: The default keymap defines Meta<Key>m as the "Compose" key.  You may set up your own
       "Compose" key with a keymap that maps some other keysym onto the Compose action.


       c3270  supports associated printer sessions via the pr3287(1) program.  The Printer action
       is used to start or stop a pr3287 session.

       The action Printer Start starts a printer session, associated with the current LU.   (This
       works only if the host supports TN3270E.)

       The action Printer Start lu starts a printer session, associated with a specific lu.

       The action Printer Stop stops a printer session.

       The  resource  c3270.printer.command  specifies  the  command  used  to print each job; it
       defaults to lpr.  The resource c3270.printer.assocCommandLine specifies the  command  used
       to start an associated printer session.  It defaults to:

              pr3287 -assoc %L% -command "%C%" %P% %H%

       The resource c3270.printer.luCommandLine specifies the command used to start a specific-LU
       printer session.  It defaults to:

              pr3287 -command "%C%" %R% %P% %L%@%H%

       When the printer session command is run, the following substitutions are made:

       Token   Substitition
       %C%     Command (value of
       %H%     Host IP address

       %L%     Current or specified LU
       %P%     Proxy specification
       %R%     Character set

       See pr3287(1) for further details.

       The resource c3270.printerLu controls automatic printer session start-up.  If it is set to
       `.', then whenever a login session is started, a printer  session  will  automatically  be
       started,  associated  with the login session.  If it is set an LU name, then the automatic
       printer session will be associated with the specified LU.


       c3270 supports the Sun telnet-passthru service provided by the in.telnet-gw server.   This
       allows  outbound telnet connections through a firewall machine.  When a p: is prepended to
       a hostname, c3270 acts much like the itelnet(1) command.  It contacts  the  machine  named
       internet-gateway  at  the port defined in /etc/services as telnet-passthru (which defaults
       to 3514).  It then passes the requested hostname and port to the in.telnet-gw server.


       The -proxy option or the c3270.proxy resource causes  c3270  to  use  a  proxy  server  to
       connect to the host.  The syntax of the option or resource is:

       The supported values for type are:

                           Proxy Type   Protocol                 Default Port
                              http      RFC 2817 HTTP tunnel         3128
                            passthru    Sun in.telnet-gw             none
                             socks4     SOCKS version 4              1080
                             socks5     SOCKS version 5 (RFC         1080
                             telnet     No protocol (just send       none
                                        connect host port)

       The special types socks4a and socks5d can also be used to force the proxy server to do the
       hostname resolution for the SOCKS protocol.


       When  running  as  a  3270  Model 5, c3270 can take advantage of terminals that can switch
       between 80 and 132 column modes.

       Because the curses library does not support  mode  switching,  the  escape  sequences  and
       resulting  screen  dimensions  must be specified explicitly to c3270.  These are specified
       with the -altscreen and -defscreen command-line options, or the  altScreen  and  defScreen
       resources.  -altscreen or altScreen defines the alternate (132-column) mode; -defscreen or
       defScreen defines the default (80-column) mode.

       The syntax for the options and resources is rowsxcols=init_string,  where  rows  and  cols
       give  the  screen  dimensions,  and  init_string is the escape sequence to transmit to the
       terminal to enter that mode.  For defscreen, the minimum dimensions are  24  rows  and  80
       columns.   For  altscreen,  the  minimum  dimensions  are 27 rows and 132 columns.  Within
       init_string, the usual escape sequences are supported (\E for escape, \r, \b, etc.).   For
       example, the init string for a 132-column xterm is:


       Note: When defscreen and altscreen are specified, the model number is always set to 5.


       Certain  c3270 options can be configured via resources.  Resources are defined in the file
       .c3270pro in the user's home directory, and by -xrm options.  The definitions are  similar
       to X11 resources, and use a similar syntax.  The resources available in c3270 are:

       Resource                   Default    Option           Purpose
       allBold                    Auto       -allbold         Display all
                                                              characters bold

       altScreen                             -altscreen       132-col screen
       blankFill                  False      -set blankFill   Blank Fill mode
       charset                    bracket    -charset         EBCDIC character
       composeMap                 latin1                      Name of composed-
                                                              character map
       cursesColorForHostColorn   (note 6)                    Color mapping T}T{
       defScreen                             -defscreen       80-col screen
       dbcsCgcsgid                                            Override DBCS CGCSGID
       dsTrace                    False      -trace           Data stream tracing
       eof                        ^D                          NVT-mode EOF
       erase                      ^H                          NVT-mode erase
       extended                   True                        Use 3270 extended
                                                              data stream
       eventTrace                 False      -trace           Event tracing
       hostsFile                             -hostsfile       Host alias/macro file
       icrnl                      False                       Map CR to NL on NVT-
                                                              mode input
       inlcr                      False                       Map NL to CR in NVT-
                                                              mode input
       intr                       ^C                          NVT-mode interrupt
       keymap                                -keymap          Keyboard map name                                             Definition of keymap
       kill                       ^U                          NVT-mode kill
       lineWrap                   False      -set lineWrap    NVT line wrap mode
       lnext                      ^V                          NVT-mode lnext
       m3279                      (note 1)   -model           3279 (color)
       metaEscape                 Auto                        Interpret ESC-x as
       mono                       (note 5)   -mono            Ignore terminal color
       monoCase                   False      -set monoCase    Mono-case mode
       noPrompt                   False      -noprompt        Disable command-
                                                              prompt mode
       numericLock                False                       Lock keyboard for
                                                              numeric field error
       oerrLock                   True                        Lock keyboard for
                                                              input error
       oversize                              -oversize        Oversize screen
       port                       telnet     -port            Non-default TCP port
       printer.*                  (note 4)                    Printer session
       printerLu                  (note 4)                    Printer session
       quit                       ^\                          NVT-mode quit
       reconnect                  False      -reconnect       Automatically
                                                              reconnect to host
       rprnt                      ^R                          NVT-mode reprint
       sbcsCgcsgid                                            Override SBCS CGCSGID
       secure                     False                       Disable "dangerous"
       termName                   (note 2)   -tn              TELNET terminal type
       traceDir                   /tmp                        Directory for trace
       traceFile                  (note 3)   -tracefile       File for trace output
       typeahead                  True                        Allow typeahead

       werase                     ^W                          NVT-mode word-erase

              Note 1: m3279 defaults to True if the terminal supports color, False otherwise.  It
              can be forced to False with the proper -model option.

              Note  2:  The  default  terminal  type string is constructed from the model number,
              color emulation, and extended data stream  modes.   E.g.,  a  model  2  with  color
              emulation  and the extended data stream option would be sent as IBM-3279-2-E.  Note
              also that when TN3270E mode is used, the terminal type is always sent as 3278,  but
              this does not affect color capabilities.

              Note  3:  The  default  trace  file  is in the directory specified by the
              traceDir resource.

              Note 4: See PRINTER SUPPORT for details.

              Note 5: mono defaults to false if the terminal supports at least 8  colors  and  to
              true otherwise.

              Note  6: The default curses color mappings for host colors 0 through 15 are: black,
              blue, red, magenta, green, cyan, yellow, white, black, blue, yellow,  blue,  green,
              cyan, black and white.

              In .c3270pro, lines are continued with a backslash character.

              -xrm options override definitions found in .c3270pro.  If more than one -xrm option
              is given for the same resource, the last one on the command line is used.




       x3270(1), s3270(1), tcl3270(1), ibm_hosts(5), x3270-script(1), telnet(1), tn3270(1)
       Data Stream Programmer's Reference, IBM GA23-0059
       Character Set Reference, IBM GA27-3831
       RFC 1576, TN3270 Current Practices
       RFC 1646, TN3270 Extensions for LUname and Printer Selection
       RFC 2355, TN3270 Enhancements


       Copyright 1993-2009, Paul Mattes.
       Copyright 2004-2005, Don Russell.
       Copyright 2004, Dick Altenbern.
       Copyright 1990, Jeff Sparkes.
       Copyright 1989, Georgia Tech Research Corporation (GTRC), Atlanta, GA
       All rights reserved.

       Redistribution and use in source and binary  forms,  with  or  without  modification,  are
       permitted provided that the following conditions are met:

       *      Redistributions of source code must retain the above copyright notice, this list of
              conditions and the following disclaimer.

       *      Redistributions in binary form must reproduce the above copyright notice, this list
              of  conditions  and  the  following  disclaimer  in  the documentation and/or other
              materials provided with the distribution.

       *      Neither the names of Paul Mattes, Don Russell, Dick Altenbern, Jeff  Sparkes,  GTRC
              nor  the  names  of  their  contributors may be used to endorse or promote products
              derived from this software without specific prior written permission.



       c3270 3.3.10ga4

                                         02 October 2009                                 c3270(1)