cu(1)



cu(1)                       General Commands Manual                      cu(1)

NAME
       cu - Call up another system

SYNOPSIS
       cu [ options ] [ system | phone | "dir" ]

DESCRIPTION
       The  cu  command is used to call up another system and act as a dial in
       terminal.  It can also do simple file transfers with no error checking.

       cu takes a single argument, besides the options.  If  the  argument  is
       the  string  "dir"  cu will make a direct connection to the port.  This
       may only be used by users with write access to the port, as it  permits
       reprogramming the modem.

       Otherwise,  if  the  argument  begins with a digit, it is taken to be a
       phone number to call.  Otherwise, it is taken to be the name of a  sys-
       tem  to  call.   The -z or --system option may be used to name a system
       beginning with a digit, and the -c or --phone option  may  be  used  to
       name a phone number that does not begin with a digit.

       cu  locates a port to use in the UUCP configuration files.  If a simple
       system name is given, it will select a port appropriate for  that  sys-
       tem.  The -p, --port, -l, --line, -s and --speed options may be used to
       control the port selection.

       When a connection is made to the remote system, cu forks into two  pro-
       cesses.   One reads from the port and writes to the terminal, while the
       other reads from the terminal and writes to the port.

       cu provides several commands that may be used during the  conversation.
       The  commands  all begin with an escape character, initially ~ (tilde).
       The escape character is only recognized at the beginning of a line.  To
       send  an  escape character to the remote system at the start of a line,
       it must be entered twice.  All commands are either a  single  character
       or a word beginning with % (percent sign).

       cu recognizes the following commands:

       ~.   Terminate the conversation.

       ~! command
            Run command in a shell.  If command is empty, starts up a shell.

       ~$ command
            Run command, sending the standard output to the remote system.

       ~| command
            Run command, taking the standard input from the remote system.

       ~+ command
            Run  command, taking the standard input from the remote system and
            sending the standard output to the remote system.

       ~#, ~%break
            Send a break signal, if possible.

       ~c directory, ~%cd directory
            Change the local directory.

       ~> file
            Send a file to the remote system.  This just dumps the  file  over
            the  communication  line.  It is assumed that the remote system is
            expecting it.

       ~<   Receive a file from the remote system.  This prompts for the local
            file  name and for the remote command to execute to begin the file
            transfer.  It continues accepting data until the contents  of  the
            eofread variable are seen.

       ~p from to, ~%put from to
            Send  a  file  to a remote Unix system.  This runs the appropriate
            commands on the remote system.

       ~t from to, ~%take from to
            Retrieve a file from a remote Unix system.  This runs  the  appro-
            priate commands on the remote system.

       ~s variable value
            Set  a cu variable to the given value.  If value is not given, the
            variable is set to true.

       ~! variable
            Set a cu variable to false.

       ~z   Suspend the cu session.  This is only supported on  some  systems.
            On  systems  for  which  ^Z may be used to suspend a job, ~^Z will
            also suspend the session.

       ~%nostop
            Turn off XON/XOFF handling.

       ~%stop
            Turn on XON/XOFF handling.

       ~v   List all the variables and their values.

       ~?   List all commands.

            cu also supports several variables.  They may be listed  with  the
            ~v command, and set with the ~s or ~!  commands.

       escape
            The escape character.  Initially ~ (tilde).

       delay
            If  this variable is true, cu will delay for a second after recog-
            nizing the escape character before printing the name of the  local
            system.  The default is true.

       eol  The list of characters which are considered to finish a line.  The
            escape character is only recognized after one of  these  is  seen.
            The default is carriage return, ^U, ^C, ^O, ^D, ^S, ^Q, ^R.

       binary
            Whether  to  transfer binary data when sending a file.  If this is
            false, then newlines in the file being sent are converted to  car-
            riage returns.  The default is false.

       binary-prefix
            A  string  used before sending a binary character in a file trans-
            fer, if the binary variable is true.  The default is ^V.

       echo-check
            Whether to check file transfers by examining what the remote  sys-
            tem  echoes  back.   This  probably  doesn't  work very well.  The
            default is false.

       echonl
            The character to look for after sending each line in a file.   The
            default is carriage return.

       timeout
            The  timeout  to  use,  in  seconds, when looking for a character,
            either when doing echo checking or when  looking  for  the  echonl
            character.  The default is 30.

       kill The  character  to use delete a line if the echo check fails.  The
            default is ^U.

       resend
            The number of times to resend a line if the echo  check  continues
            to fail.  The default is 10.

       eofwrite
            The string to write after sending a file with the ~> command.  The
            default is ^D.

       eofread
            The string to look for when receiving a file with the ~<  command.
            The default is $, which is intended to be a typical shell prompt.

       verbose
            Whether  to  print accumulated information during a file transfer.
            The default is true.

OPTIONS
       The following options may be given to cu.

       -e, --parity=even
            Use even parity.

       -o, --parity=odd
            Use odd parity.

       --parity=none
            Use no parity.  No parity is also used  if  both  -e  and  -o  are
            given.

       -h, --halfduplex
            Echo characters locally (half-duplex mode).

       --nostop
            Turn off XON/XOFF handling (it is on by default).

       -f, --nortscts
            Do not use hardware flow control.

       -E char, --escape char
            Set  the escape character.  Initially ~ (tilde).  To eliminate the
            escape character, use -E ''.

       -z system, --system system
            The system to call.

       -c phone-number, --phone phone-number
            The phone number to call.

       -p port, --port port
            Name the port to use.

       -a port
            Equivalent to --port port.

       -l line, --line line
            Name the line to use by giving a device name.  This may be used to
            dial  out  on  ports that are not listed in the UUCP configuration
            files.  Write access to the device is required.

       -s speed, --speed speed
            The speed (baud rate) to use.

       -#   Where # is a number, equivalent to --speed #.

       -n, --prompt
            Prompt for the phone number to use.

       -d   Enter debugging mode.  Equivalent to --debug all.

       -x type, --debug type
            Turn on particular debugging types.  The following types are  rec-
            ognized:  abnormal, chat, handshake, uucp-proto, proto, port, con-
            fig, spooldir, execute, incoming, outgoing.  Only abnormal,  chat,
            handshake,  port, config, incoming and outgoing are meaningful for
            cu.

            Multiple types may be given, separated by commas, and the  --debug
            option  may  appear  multiple  times.  A number may also be given,
            which will turn on that many types from the  foregoing  list;  for
            example,   --debug  2  is  equivalent  to  --debug  abnormal,chat.
            --debug all may be used to turn on all debugging options.

       -I file, --config file
            Set configuration file to use.  This option may not be  available,
            depending upon how cu was compiled.

       -v, --version
            Report version information and exit.

       --help
            Print a help message and exit.

BUGS
       This program does not work very well.

AUTHOR
       Ian Lance Taylor <ian@airs.com>

                               Taylor UUCP 1.07                          cu(1)

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