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).

       -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)