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1# Get the IP of the remote ssh client (64.233.160.1).
2txor@lulz# netstat -putan | grep SHE | grep ssh
3tcp        0      0 192.168.1.1:22          64.233.160.1:55783      ESTABLISHED 15908/sshd: txor [p
4
5# Get the DISPLAY value of that IP.
6txor@lulz# ps aeo pid,command | grep SSH_CLIENT=192.168.1.12 | grep -v grep | sed -e 's:.* DISPLAY=\([^ ]*\) .*:\1:'
7localhost:10.0
8
9# Send the message!
10DISPLAY=localhost:10.0 xmessage "I Can Has Cheezburger?"