4.3 Command Line Help
4.3.2 The man command
The man command is used to display online man pages for any of the hundreds of UNIX commands which are available. You can get a listing of all of the UNIX commands with a brief description of what they do by entering man intro at the command line. You can even display a man page on the man command itself by typing man man.

There are several ways to use the man command. The basic form is man name where name is the name of the command for which you want information. There are several handy options to the man command for performing keyword searches and displaying specific sections of the Programmer's Manual.

$ man name - Provides help on a particular command where name is the name of the command you wish to get help with such as ls, cat or mkdir

$ man -k keyword - Searches the man pages table of contents for the specified keyword and displays a one-line summary for each entry

$ man -s section name - Displays a particular section of the man pages which can include multiple commands