1. Name
apropos - search the manual page names and descriptions
2. Synopsis
apropos [-dhV] [-e|-w|-r] [-s section] [-m system[,...]] [-M path] [-C file] keyword ...
3. 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.
4. Examples
This command searches keyword in command description. What commands are related to partitions:
 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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