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cu(1)											    cu(1)

       cu - Call up another system

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

       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 system 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 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  recog-
       nized 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 stan-
	    dard 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

       ~! 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.

	    Turn off XON/XOFF handling.

	    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.

	    The escape character.  Initially ~ (tilde).

	    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 recognized after one of these is seen.  The default is carriage  return,  ^U,
	    ^C, ^O, ^D, ^S, ^Q, ^R.

	    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.

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

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

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

	    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.

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

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

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

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

       The following options may be given to cu.

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

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

	    Use no parity.  No parity is also used if both -e and -o are given.

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

	    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

       -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, handshake, uucp-proto, proto, port, config, spooldir, execute, incoming, outgo-
	    ing.  Only abnormal, chat, handshake, port, config, incoming and outgoing  are  mean-
	    ingful 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.

	    Print a help message and exit.

       This program does not work very well.

       The file name may be changed at compilation time, so this is only an approximation.

       /etc/uucp/config - Configuration file.
       /etc/uucp/oldconfig/ - Alternative configuration (HDB or V2 format)

       Ian Lance Taylor <ian@airs.com>

					 Taylor UUCP 1.06				    cu(1)
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