The command character and all the key bindings can be fully customized. By default, each command begins with a Ctrl + A, and is followed by one other keystroke. The only exception to this is the one keystroke that is used to initiate a command to the window manager. Everything that you type is sent to the program running in the current window session. Screen runs these as sub-shells, unless told otherwise. ![]() Shells usually distinguish between running as a login shell or a sub shell. If this window was in the foreground, the display is then switched to the previous window. When a program terminates, screen kills the window that contained it. Programs will continue to run even when their window is not currently visible and even when the whole screen session is detached from the user's terminal. ![]() All windows run their programs independently of each other. At any time, you can create new full screen windows with other programs in them, kill existing windows, view a list of running windows, toggle output logging on and off, copy and paste text between windows, view the scroll back history and switch between windows. When the screen utility is called, it creates a single window with a shell in it or the specified command. A copy and paste mechanism is also available allowing text to be copied from one terminal window to another. ![]() Each screen that is created has its own history. Screen is a very useful utility that allows a user or administrator to create multiple screens (interactive shells) from within one window and then manage these sessions easily.
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