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From: Pieter de Goeje <pieter@degoeje.nl>
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Cc: Jeremy Gransden <jeremy.gransden@gmail.com>
Subject: Re: See output of local xterm session on remote ssh session.
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On Saturday 02 June 2007, Jeremy Gransden wrote:
> Hello,
>
> I have been searching Google for a few days for this but have not been
> coming up with the correct answer. Then again maybe I am asking the wrong
> question... If I start a process, i.e. compile a kernel, on my desktop, how
> can I then connect to it from my laptop and see the output of that process
> via the ssh session?
>
> thanks,
> Jeremy
screen(1) is the tool for this. You can find it in the ports collection 
(sysutils/screen).

For example:
$ screen
$ cd /usr/src; sudo make buildworld
(now press CTRL+A D)

On the other machine, ssh into the desktop
$ screen -r
(press CTRL+A D if you've seen enough)

Also, this will protect the running job from accidental (or purposefully) 
closure of the terminal.

HTH,
Pieter de Goeje