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       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

       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.

       -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       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 3278-4.

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

              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

       -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"

       -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.

       -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

       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 /tmp/


       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

       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,
       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 host.

              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

       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

       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           3128
                                 tunnel (squid)
                     passthru    Sun in.telnet-gw        none
                      socks4     SOCKS version 4         1080
                      socks5     SOCKS version 5         1080
                                 (RFC 1928)
                      telnet     No protocol (just       none
                                 send connect host

       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
                                                              character map
       cursesColorForHostColorn   (note 6)                    Color mapping
       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

       *      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)