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(emacs)Repeating

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Repeating a Command
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   Many simple commands, such as those invoked with a single key or
with `M-x COMMAND-NAME <RET>', can be repeated by invoking them with a
numeric argument that serves as a repeat count (Note: Arguments).
However, if the command you want to repeat prompts for some input, or
uses a numeric argument in another way, repetition using a numeric
argument might be problematical.

   The command `C-x z' (`repeat') provides another way to repeat an
Emacs command many times.  This command repeats the previous Emacs
command, whatever that was.  Repeating a command uses the same arguments
that were used before; it does not read new arguments each time.

   To repeat the command more than once, type additional `z''s: each
`z' repeats the command one more time.  Repetition ends when you type a
character other than `z', or press a mouse button.

   For example, suppose you type `C-u 2 0 C-d' to delete 20 characters.
You can repeat that command (including its argument) three additional
times, to delete a total of 80 characters, by typing `C-x z z z'.  The
first `C-x z' repeats the command once, and each subsequent `z' repeats
it once again.