(emacs.info) Disabling

 
 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
 confused.
 
    An attempt to invoke a disabled command interactively in Emacs
 displays 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 it, or cancel.  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 put 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
           "It's better to use `kill-region' instead.\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.   Init File.
 
    Whether a command is disabled is independent of what key is used to
 invoke it; disabling also applies if the command is invoked using
 `M-x'.  Disabling a command has no effect on calling it as a function
 from Lisp programs.
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