How to find information about commands

man - format and display the on-line manual pages

SYNOPSIS

         man [-acdfFhkKtwW] [--path] [-m system] [-p string] [-C config_file] [-M pathlist]
       [-P pager] [-B browser] [-H htmlpager] [-S section_list] [section] name ...

DESCRIPTION

man formats and displays the on-line manual pages. If you specify section, man only looks in that section of the manual. name is normally the name of the manual page, which is typically the name of a command, function, or file.

The output of man ls command:

  man_ls.JPG

The apropos command can be used before man in order to find all the man pages for commands which contain a certain word.

apropos.JPG 

The same purpose has whatis command. whatis – searches the whatis database for complete words.
Example of using whatis command:

whatis.JPG 

To review all man pages related to the command use -a option. For example: man nano -a

man_nano.JPG 

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