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Important special-purpose commands

quits the current command. Generally useful for cancelling a M-x-style command or other multi-character command that you have started entering. When in doubt, use it.
C-x C-c
exits from Emacs. It prompts (in the echo area) if there are any buffers that have not been properly saved.
C-x u
undoes the effects of the last editing command. If repeated, it undoes each of the preceding commands in reverse order (there is a limit). This is an extremely important command; be sure to master it. This does not undo other kinds of commands; the cursor may end up at some rather odd places.
redraws the screen, and positions the current line to the center of the current window.

David Wolfe