Provided by: c3270_3.3.7p7-1build1_i386 bug


       c3270 - curses-based IBM host access tool


       c3270 [options] [host]


       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

       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

       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 ID.)

       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 hostnames.

       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 shell.

       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.  See CHARACTER SETS

       -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

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

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

       -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       30
                                 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 3278-4.

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

       -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.

       -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.

              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"

       -trace Turns on data stream and event tracing at startup.  The  default
              trace file name is /tmp/x3trc.process_id.

       -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 respectively.

       -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.




       x3270(1),   s3270(1),   tcl3270(1),   ibm_hosts(5),    x3270-script(1),
       pr3287(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


       Modifications and original code Copyright 1993, 1994, 1995, 1996, 1997,
       1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 by Paul Mattes.
       DFT File Transfer Code Copyright  October 1995 by Dick Altenbern.
       RPQNAMES Code Copyright  2004, 2005 by Don Russell.
       Original X11 Port Copyright 1990 by Jeff Sparkes.
              Permission to use, copy, modify, and  distribute  this  software
              and  its documentation for any purpose and without fee is hereby
              granted, provided that the above copyright notice appear in  all
              copies  and  that both that copyright notice and this permission
              notice appear in supporting documentation.
       Copyright 1989 by Georgia Tech Research Corporation, Atlanta, GA 30332.
              All  Rights  Reserved.   GTRC  hereby  grants public use of this
              software.   Derivative  works  based  on  this   software   must
              incorporate this copyright notice.
       c3270  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  file LICENSE for more


       c3270 3.3.7p7

                                 04 July 2008                         c3270(1)