Manual (man) Pages
Every Linux workstation has manual (man) pages that you can read. To read the man pages, use the command man at a shell prompt. To look for a page by keyword, use:
man -k keyword
where keyword would be the term you are searching for. This command will display a list of commands whose man pages contain the keyword you want. To read a particular man page, do:
where command is the name of the command whose man page you want to read.