Apropos

apropos

apropos searches man pages descriptions for instances of keyword.

keyword is usually a regular expression, as if (-r) was used, or may contain wildcards (-w), or match the exact keyword (-e).
Using these options, it may be necessary to quote the keyword or escape () the special characters to stop the shell from interpreting them.

The standard matching rules allow matches to be made against the page name and word boundaries in the description.

The database searched by apropos is updated by the mandb program. Depending on your installation, this may be run by a periodic cron job, or may need to be run manually after new manual pages have been installed.

man apropos

apropos <keyword>