[lug] auto set DISPLAY variable from ssh login?

[Jeff Schroeder]

> Does anyone know if there is a way to automate setting of DISPLAY
> based on the remote IP of an ssh text login? And better yet, to do so
> only for certain IP addresses?

From what I can tell, when you login to a remote server via SSH, a few 
environment variables are set:

# env | grep SSH
SSH_CLIENT=192.168.1.107 52876 22
SSH_TTY=/dev/ttyp1
SSH_CONNECTION=192.168.1.107 52876 192.168.1.100 22

In the example above, I've logged into 192.168.1.100 from 192.168.1.107.  
You can see those addresses in the SSH_CONNECTION variable.

Thus, to answer your question, you could put something into your .bashrc 
(or .cshrc, etc.) that would set DISPLAY for you:

remote_ip=$(echo $SSH_CLIENT | awk '{ print $1 }')
export DISPLAY=$remote_ip:0.0

This would redirect the display to the client machine (I do this myself, 
so I can run X apps on a remote machine but display them locally).  You 
mentioned that you only want to do this for certain IP addresses, so 
you could then add some logic:

if [ "$remote_ip" == "192.168.1.107" ]; then
  export DISPLAY=$remote_ip:0.0
fi

Adjust as needed.

HTH,
Jeff
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