I think it was screen.

A former student has convinced me that the guy had me ssh to his
machine to get around our school firewall. Then he tunneled back to my
machine. Apparently, I changed my password to something like
"abcd1234" so he could log in as me, join the screen, and then I could
follow along.

Wow, I was trusting back then. Of course, the computer wasn't working
at all at the time, so I wasn't risking much.

Todd

On Thu, Jun 7, 2012 at 8:59 PM, Angus Gratton <g...@projectgus.com> wrote:
> On Thu, 7 Jun 2012 20:31:10 -0400
> "Todd O'Bryan" <toddobr...@gmail.com> wrote:
>
>> When I was first starting with LTSP (9 or 10 years ago?), a kind soul
>> from Germany had me connect to his machine and then reconnected back
>> to mine so that he could type commands in the terminal while I
>> watched. It was the only way I got everything up and running.
>>
>> Now I'm having my students set up Linux machines at home, and they
>> inevitably screw up something by leaving off a slash or a dot or being
>> in the wrong directory when they issue some command. It would be
>> really convenient to be able to remote-control their terminals, but I
>> don't  even know what to Google for.
>>
>> Anyone know of a how-to they could point me to, or what the guy
>> probably did so I can search for it?
>>
>>
>
> As Rob said, it may be GNU Screen or possibly tmux (in my limited
> experience, tmux's way of sharing terminals via Unix sockets is more
> pleasant to use than screen's multiuser mode, assuming you're both
> logging in as different users not the same user.)
>
> For what it's worth, there's also reptyr which allows you to grab a tty
> even if it wasn't originally started in the screen/tmux environment.
> It's a bit black-magic-hack, but it's pretty useful when you need it:
>
> https://github.com/nelhage/reptyr
>
> You still need to be able to be logged into the same machine
> though.
>
> - Angus
>
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Exclusive live event will cover all the ways today's security and 
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