Cory Petkovsek wrote:

> I want to duplicate output (and input) of one terminal to another.  How can
> I do this?  
> 
> Here is an applied scenario:  I'm training someone 100 miles away.  I can
> ssh into their system, while he will log in locally.  I know how to directly
> write to another terminal: "echo Hi > /dev/pts/1".  How can we share a
> terminal so that I can at least see what he is typing and what the output
> is.  If I could type as well that would be great.  We are talking console
> only here.  However using X is a possibility if there is no console
> solution.

        script -f /tmp/ttylog

That only lets one of you type, but the other can watch using

        tail -f /tmp/ttylog &

The nontypist can run write(1) to send one-line messages to the
typist.

        write /dev/console    # or whatever the correct tty is

Script, tail and write were both around before 1980, BTW.  Nothing new
in console software.

-- 
Bob Miller                              K<bob>
kbobsoft software consulting
http://kbobsoft.com                     [EMAIL PROTECTED]

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