How to use the Apropos Command

In this Linux tip, we’ll take a look at the apropos command and how it can help you identify commands that you want to use. The meaning of the word apropos is “fitting and to the point”. When you use this command on the Linux command line, you can expect it to generate a list of commands that fit what you’re asking about.
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[@bobsalita3417]

InfoWorld videos deserve more attention.

[@jhswartz]

On some systems apropos(1) is a symlink to whatis(1), and on some systems there's neither. But your UNIX-like OS might have an implementation of man(1) that provides the same functionallity via the -k parameter.
ie: man -k halt