Unix in a Nutshell, 4th Edition

Macros

:ab in out	Use in as abbreviation for out in insert mode.
:unab in	Remove abbreviation for in.
:ab	List abbreviations.
:map string sequence	Map characters string as sequence of commands. Use #1, #2, etc., for the function keys.
:unmap string	Remove map for characters string.
:map	List character strings that are mapped.
:map! string sequence	Map characters string to input mode sequence.
:unmap! string	Remove input mode map (you may need to quote the characters with CTRL-V).
:map!	List character strings that are mapped for input mode.
q x	Record typed characters into register specified by letter x. If letter is uppercase, append to register. {vim}
q	Stop recording. {vim}
@ x	Execute the register specified by letter x. Use @@ to repeat the last @ command.

In vi, the following characters are unused in command mode and can be mapped as user-defined commands:

Letters

g K q V v

Control keys

^A ^K ^O ^W ^X ^_ ^\

Symbols

_ * \ = #

Tip

The = is used by vi if Lisp mode is set. Different versions of vi may use some of these characters, so test them before using.

vim does not use ^K, ^_, _, or \.