[Osiris]

Source Linux Tips: Modify ctrl-alt-del behavior

If you are migrating over from Windows you know the Ctrl-Alt-Del three finger salute brings up a ulitity that can help you stop out of control or frozen applications. And then, of course, a second three-finger salute might find your machine rebooting (for when those apps just don’t want to unfreeze.) The default behavior for this in Linux to to immediately reboot your machine. That is fine if you’re not used to hitting that combination every time an application goes postal on your machine. But if that is what you are accustomed to doing, you might have a hard time adjusting to the difference in behavior.
Think about it, Firefox freezes and you instantly go for Ctrl-Alt-Del only to have your machine instantly reboot. What kind of work could you lose? Fortunately you can prevent or even alter this behavior in Linux. And doing so only requires you to open up a flat text file in your favorite editor, make a change, and save the file.