Emacs: Finding all commands with this or that in their names

Question

Is there a way to search through all the registered commands in emacs, along with their names? For example, can I find all emacs commands with "kill" in their name?

I cannot find a list of all of emacs commands, this comes the closest but does not have the names of each command, only the keybindings. However, this method requires browsing the web, an inbuilt glossary of emacs commands would be preferred...

Answer 1

Use the command apropos-command:

C-h a kill RET

There are analoguous commands apropos-variable and apropos (which searches for commands, functions and variables).

Answer 2

As @jch said, and as you found by googling: apropos-command is your friend. Likewise, the other apropos* commands. But that's just the beginning of Emacs apropos help.

If you use library Icicles then each time you are prompted for the name of a command, function, variable, face, buffer, file,...whatever, you have built-in, incremental, apropos help.

That is, Icicles completion of such a name lets you use a regexp or a substring, not just a prefix, pattern - always. This apropos completion is the single most useful Icicles feature.

In addition, you can use multiple patterns to filter the matching candidates. It is a lot easier to use two or more simple patterns than it is to try to come up with a complex regexp that gives you the same set of matches. This is progressive completion.

Finally, Icicles gives you other apropos features as well. It enhances vanilla apropos commands, provides additional apropos commands, and gives you help on each completion candidate - both short, mode-line descriptions (what the apropos* commands give you) and complete doc strings on demand.