Apropos

From Linuxconfig.org

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Name

apropos - search the manual page names and descriptions

Synopsis - man page

apropos  [-dhV] [-e|-w|-r] [-s section] [-m system[,...]] [-M path] [-C file] keyword ...

Frequently used options

-s section, --section section
              Search only the given manual section.
-e, --exact
              Each  keyword will be exactly matched against the page names and
              the descriptions.

Examples

This command searches keyword in command description. What commands are related to partitions:

$ apropos partition

or what was the command that I used yesterday to scan all ports on my server:

$ apropos scanner

search for commands only in the manual section 1

$ apropos -s 1 partition

match only exact words:

$ apropos -e scan

number of outputs with and without -e option:

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