uucpand its supporting communications utilities. When you were connected to a remote system via the
cuutility, you could escape back to your home system, without dropping the connection, with the ~! directive. This was invaluable in the age when X11 and AT&T's layers windowing utilities were still only in use in big-budget IT shops.
From the man page:
The transmit process interprets the following user initiated
~. Terminates the conversation.
~! Escapes to an interactive shell on the local system.
Runs cmd on the local system (via sh -c).
Runs cmd locally and send its output to the remote
~%cd Changes the directory on the local system. Note: ~!cd
will cause the command to be run by a sub-shell, prob-
ably not what was intended.
~%take from [to]
Copies file from (on the remote system) to file to on
the local system. If to is omitted, the from argument
is used in both places.
~%put from [to]
Copies file from (on local system) to file to on
remote system. If to is omitted, the from argument is
used in both places.
Sends the line ~ line to the remote system.
Transmits a BREAK to the remote system (which can
also be specified as ~%b).
Toggles the -d debugging option on or off (which can
also be specified as ~%d).
~t Prints the values of the termio structure variables
for the user's terminal (useful for debugging).
~l Prints the values of the termio structure variables
for the remote communication line (useful for debug-
~%ifc Toggles between DC3/DC1 input control protocol and no
input control. This is useful when the remote system
does not respond properly to the DC3 and DC1 charac-
ters (can also be specified as ~%nostop).
~%ofc Toggles the output flow control setting. When
enabled, outgoing data may be flow controlled by the
remote host (can also be specified as ~%noostop).
Allows/disallows unsolicited diversions. That is,
diversions not specified by ~%take.
~%old Allows/disallows old style syntax for received diver-
Same as ~%ifc.
The receive process normally copies data from the remote
system to the standard output of the local system. It may
also direct the output to local files.
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Copyright (except man page excerpt) © 2007 David Breneman, Rosedale Audio Productions