Name Help Help Library Keywords
A more sophisticated sort of question to ask is, ``What are the
commands for working with files?'' To ask this question, type C-h a file
RET, which displays a list of all command names that
so on. With each command name appears a brief description of how to use
the command, and what keys you can currently invoke it with. For
example, it would say that you can invoke
find-file by typing
C-x C-f. The a in C-h a stands for `Apropos';
C-h a runs the command
apropos-command. This command
normally checks only commands (interactive functions); if you specify a
prefix argument, it checks noninteractive functions as well.
Because C-h a looks only for functions whose names contain the
string you specify, you must use ingenuity in choosing the
string. If you are looking for commands for killing backwards and
C-h a kill-backwards
RET doesn't reveal any, don't give up.
Try just kill, or just backwards, or just back. Be
persistent. Also note that you can use a regular expression as the
argument, for more flexibility (see Regexps).
Here is a set of arguments to give to C-h a that covers many
classes of Emacs commands, since there are strong conventions for naming
the standard Emacs commands. By giving you a feel for the naming
conventions, this set should also serve to aid you in developing a
technique for picking
To list all user variables that match a regexp, use the command M-x apropos-variable. This command shows only user variables and customization options by default; if you specify a prefix argument, it checks all variables.
To list all Lisp symbols that contain a match for a regexp, not just the ones that are defined as commands, use the command M-x apropos instead of C-h a. This command does not check key bindings by default; specify a numeric argument if you want it to check them.
apropos-documentation command is like
that it searches documentation strings as well as symbol names for
matches for the specified regular expression.
apropos-value command is like
apropos except that it
searches symbols' values for matches for the specified regular
expression. This command does not check function definitions or
property lists by default; specify a numeric argument if you want it to
If the variable
apropos-do-all is non-
nil, the commands
above all behave as if they had been given a prefix argument.
If you want more information about a function definition, variable or
symbol property listed in the Apropos buffer, you can click on it with
Mouse-2 or move there and type