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cu(1)                                                                                                  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 sim-ple simple
       ple 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 system to call.  The -z or --system option may be used to name a sys-tem system
       tem 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 system.  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 processes.  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 appropriate  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 recognizing 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 rec-
            ognized 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 carriage returns.  The default is false.

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

       echo-check
            Whether to check file transfers by examining what the remote system 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).

       -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 recognized: abnormal,  chat,  hand-
            shake,  uucp-proto,  proto, port, config, 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 com-piled. compiled.
            piled.

       -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)