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The actions of many commands can be altered by giving them a numeric
argument, this argument is entered immediately prior to invoking the
command (they are technically called prefix arguments).
Each argument is built using a number of special key sequences,
- Meta-0 to Meta-9
-
Append a digit to the end of the current prefix argument. Use a sequence
of these keys to build up a decimal number. For example typing
Meta-1 Meta-0 Meta-0 creates an argument of 100 for the following
command.
- Meta--
-
(That's Meta-minus.) Negates the value of current argument, if the
command is invoked after a single Meta-- prefix the actual argument
is -1.
- Ctrl-u
-
Successive Ctrl-u key presses multiply the argument by 4 each time.
Note that any existing argument entered by the numeric or minus commands
(described above) is discarded with the first Ctrl-u.
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