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Redirecting Input and Output
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13.12 Writing to Multiple Terminals for Demonstrations

To show what one person is typing, and let people watch at other terminals:

  1. 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
    
    

    Use exit to leave the shell. To start a Bourne shell, type sh instead of csh .

  2. Everyone who wants to watch types:

    tail -f
     
    
tail -f /tmp/log
    
    

    and uses CTRL-c to kill tail-f 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 vi 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 csh  -iv to start the demonstrator's C shell or sh  -iv for a Bourne shell.

- JP


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