Here are a few keyboard shortcuts command; you can use to perform common tasks quickly.

[Ctrl] + [Alt] + [Backspace] = kills your current X session. Kills your graphical desktop session and returns you to the login screen.
[Ctrl] + [Alt] + [Delete] = From a non-graphical shell prompt, shuts down your Red Hat Enterprise Linux system. Use only when the normal shutdown procedure does not work. In a graphical desktop session, this shortcut displays the desktop logout screen that allows you to logout, reboot, or shut down your system.
[Ctrl] + [Alt] + [Fn] = switches screens. [Ctrl]+[Alt] + one of the function keys displays an available screen. By default, [F1] through [F6] are text-mode shell prompt screens and [F7] is the graphical desktop screen.
[Alt] + [Tab] = switches tasks in a graphical desktop environment. If you have more than one application open at a time, you can use [Alt] + [Tab] to switch among open tasks and applications.
[Ctrl] + [a] = moves cursor to the beginning of a line. This works in most text editors and in the URL field in Mozilla.
[Ctrl] + [d] = logout of (and close) shell prompt. Use this quick shortcut instead of typing exit or logout.
[Ctrl] + [e] = moves cursor to end of a line. This works in most text editors and in the URL field in Mozilla.
[Ctrl] + [l] = clears the terminal. This shortcut does the same thing as typing clear at a command line.
[Ctrl] + [u] = clears the current line. If you are working in a terminal, use this shortcut to clear the current line from the cursor all the way to the beginning of the line.
[Middle Mouse Button] = pastes highlighted text. Use the left mouse button to highlight the text. Point the cursor to the spot where you want it pasted. Click the middle mouse button to paste it. In a system with a two-button mouse, if you configured your mouse to emulate a third mouse button, you can click both the left and right mouse buttons simultaneously to perform a paste.
[Tab] = command auto complete. Use this command when using a shell prompt. Type the first few characters of a command or filename and then press the [Tab] key. It will automatically complete the command or show all commands that match the characters you typed.
[Up] and [Down] Arrow = shows command history. When using a shell prompt, press the [up] or [down] arrow to scroll through a history of commands you have typed from the current directory. When you see the command you want to use, press [Enter].

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