GNU Screen is one of the most useful utilities you can have at your disposal if you spend any time at all working at the command line. Screen allows you to manage multiple shell sessions from one terminal window or console, view multiple shell sessions at the same time, and even log into the same session from more than one location at a time. The screen utility is a "window manager" that allows you to organize and work with multiple shell sessions in a very powerful way. Utilizing screen, you can manage shell sessions in all kinds of useful ways. This tutorial will show you how to display two or more sessions simultaneously in the same window, "detach" from a session and log in later, and even log into the same session from more than one system.