duplicate output to multiple terminals

[Tom Soukup ~]

In article <4647 at cbnewsc.ATT.COM> psfales at cbnewsc.ATT.COM (Peter Fales) writes:
>In article <256 at telxon.UUCP>, dank at telxon.UUCP (Dan Kelley) writes:
>> I am looking for an idea to duplicate output on different terminals.
>The "teacher" executes the following command:
>	cu XXXX	| tee /tmp/tmpfile
>The "students" run 
>	tail -f /tmp/tmpfile
>I don't totally understand why this works, but it does.  You can even
>see all the "teacher's" key strokes in real time.

This works because tail -f writes the contents of the file to the standard
output (the screen) and then waits.  As additional characters are put into
the file, tail -f continues writing them to the screen.  It will continue
waiting forever (I think) unless interupted.  So the cu | tee copies
everything that the cu echos into tmpfile and the tail prints everything
that goes into tmpfile on thr students screen.  Good idea, I wish I'd
thought of it :-).

>Peter Fales			AT&T, Room 5B-420

Tom
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