To show what one person is typing, and let people watch at other terminals:
The person doing the demonstration starts an interactive shell
with a command like:
csh -i |& tee /tmp/log
csh -i 2>&1 | tee /tmp/log
to leave the shell.
To start a Bourne shell, type
Everyone who wants to watch types:
when they're done.
There are a couple of gotchas:
The person who's doing the demonstration won't be able to use full-screen programs like
that expect their
outputs to go to a terminal (instead of a pipe).
Commands may echo onto the screen but not into the log file.
If that happens, type
to start the demonstrator's C shell
for a Bourne shell.