GNU/Linux Command – WHATIS

whatis — Search the whatis database for complete words.
 
Summary:
Whatis DB contains the name and one line description about all man pages. whatis searches for keywords and displays the result(s). Only complete word matches are displayed.
 
Examples:
$ whatis ls -- Show small info about ls command.  $ whatis perl -- Show small info about Perl.  $ whatis gcc -- Show small info about GCC command.  $ whatis printf -- Show small info about printf.  $ whatis socket -- Show small info about socket.  $ whatis compile -- Just try (Error).  Location of whatis DB: /var/cache/man/whatis
Read: man whatis

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