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Running Commands by Name

   The Emacs commands that are used often or that must be quick to type
are bound to keys--short sequences of characters--for convenient use.
Other Emacs commands that do not need to be brief are not bound to
keys; to run them, you must refer to them by name.

   A command name is, by convention, made up of one or more words,
separated by hyphens; for example, `auto-fill-mode' or `manual-entry'.
The use of English words makes the command name easier to remember than
a key made up of obscure characters, even though it is more characters
to type.

   The way to run a command by name is to start with `M-x', type the
command name, and finish it with RET.  `M-x' uses the minibuffer to
read the command name.  RET exits the minibuffer and runs the command.
The string `M-x' appears at the beginning of the minibuffer as a
"prompt" to remind you to enter the name of a command to be run.  *Note
Minibuffer::, for full information on the features of the minibuffer.

   You can use completion to enter the command name.  For example, the
command `forward-char' can be invoked by name by typing

     M-x forward-char RET

     M-x fo TAB c RET

Note that `forward-char' is the same command that you invoke with the
key `C-f'.  You can run any Emacs command by its name using `M-x',
whether or not any keys are bound to it.

   If you type `C-g' while the command name is being read, you cancel
the `M-x' command and get out of the minibuffer, ending up at top level.

   To pass a numeric argument to the command you are invoking with
`M-x', specify the numeric argument before the `M-x'.  `M-x' passes the
argument along to the command it runs.  The argument value appears in
the prompt while the command name is being read.

   Normally, when describing a command that is run by name, we omit the
RET that is needed to terminate the name.  Thus we might speak of `M-x
auto-fill-mode' rather than `M-x auto-fill-mode RET'.  We mention the
RET only when there is a need to emphasize its presence, such as when
we show the command together with following arguments.

   `M-x' is defined to run the command `execute-extended-command',
which is responsible for reading the name of another command and
invoking it.

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