GNU/Linux Command – WHATIS

whatis — Search the whatis database for complete words.
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.
$ 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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