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Unix Version 7 - man page for cu (v7 section 1C)

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CU(1C)											   CU(1C)

       cu - call UNIX

       cu telno [ -t ] [ -s speed ] [ -a acu ] [ -l line ]

       Cu calls up another UNIX system, a terminal, or possibly a non-UNIX system.  It manages an
       interactive conversation with possible transfers of text files.	Telno  is  the	telephone
       number,	with  minus  signs at appropriate places for delays.  The -t flag is used to dial
       out to a terminal.  Speed gives the transmission speed (110, 134, 150, 300, 1200); 300  is
       the default value.

       The  -a and -l values may be used to specify pathnames for the ACU and communications line
       devices.  They can be used to override the following built-in choices:

       -a /dev/cua0 -l /dev/cul0

       After making the connection, cu runs as two processes: the send process reads the standard
       input  and  passes  most  of  it  to the remote system; the receive process reads from the
       remote system and passes most data to the standard output.  Lines beginning with `~'  have
       special meanings.

       The send process interprets the following:

       ~.		 terminate the conversation.
       ~EOT		 terminate the conversation

       ~<file		 send  the  contents of file to the remote system, as though typed at the

       ~!		 invoke an interactive shell on the local system.

       ~!cmd ...	 run the command on the local system (via sh -c).

       ~$cmd ...	 run the command locally and send its output to the remote system.

       ~%take from [to]  copy file `from' (on the remote system) to file `to' on the  local  sys-
			 tem.  If `to' is omitted, the `from' name is used both places.

       ~%put from [to]	 copy  file  `from'  (on local system) to file `to' on remote system.  If
			 `to' is omitted, the `from' name is used both places.

       ~~...		 send the line `~...'.

       The receive process handles output diversions of the following form:

       zero or more lines to be written to file

       In any case, output is diverted (or appended, if `>>' used) to the file.  If `:' is  used,
       the  diversion is silent, i.e., it is written only to the file.	If `:' is omitted, output
       is written both to the file and to the standard output.	The trailing `~>' terminates  the

       The use of ~%put requires stty and cat on the remote side.  It also requires that the cur-
       rent erase and kill characters on the remote system be identical to the	current  ones  on
       the local system.  Backslashes are inserted at appropriate places.

       The use of ~%take requires the existence of echo and tee on the remote system.  Also, stty
       tabs mode is required on the remote system if tabs are to be copied without expansion.


       dn(4), tty(4)

       Exit code is zero for normal exit, nonzero (various values) otherwise.

       The syntax is unique.

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