Linux-help commands

To get help on commands

help <command name>
    eg: help cat
<command name> --help
    eg: grep --help
<command name> -h
    eg: chmod -h
whatis <command name>
    eg: whatis grep

To get man pages

man <command name>
    eg: man ls

To search for a particular word within a man page type /word

To quit from a man page, just type the Q key

If you don’t remember the actual command:

man -k <keyword to search>
    eg: man -k permission
    //You will find a line in the output that looks something like: chmod (1) - change permissions of a file

To get info pages

info <command name>