z-computer-z

If you wanna run some script on logout, your answer is here. Do this :
Go to /etc/gdm/PostSession directory and open a file named Default,

$ vi /etc/gdm/PostSession/Default


Call your script before exit 0


#!/bin/sh
call your script here
exit 0


Save the file, and now the script will be executes everytime you logout from your computer.