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Disabling Commands

   Disabling a command marks the command as requiring confirmation
before it can be executed.  The purpose of disabling a command is to
prevent beginning users from executing it by accident and being

   Attempting to invoke a disabled command interactively in Emacs
causes the display of a window containing the command's name, its
documentation, and some instructions on what to do immediately; then
Emacs asks for input saying whether to execute the command as
requested, enable it and execute, or cancel it.  If you decide to
enable the command, you are asked whether to do this permanently or
just for the current session.  Enabling permanently works by
automatically editing your `.emacs' file.

   The direct mechanism for disabling a command is to have a non-`nil'
`disabled' property on the Lisp symbol for the command.  Here is the
Lisp program to do this:

     (put 'delete-region 'disabled t)

   If the value of the `disabled' property is a string, that string is
included in the message printed when the command is used:

     (put 'delete-region 'disabled
          "Text deleted this way cannot be yanked back!\n")

   You can make a command disabled either by editing the `.emacs' file
directly or with the command `M-x disable-command', which edits the
`.emacs' file for you.  Likewise, `M-x enable-command' edits `.emacs'
to enable a command permanently.  Note: Init File.

   Whether a command is disabled is independent of what key is used to
invoke it; it also applies if the command is invoked using `M-x'.
Disabling a command has no effect on calling it as a function from Lisp

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