Getting Help: The Linux Manual

There are many commands and very often they have many parameters. It is not necessary to memorize all of them because almost every command has a manual page.

$ man         → Display a manual page for a command.
$ man ls   → Display the manual page for the command ls.
$ man man → Description of the command man. 

For a quick overview, it is often enough to use the help output of the command itself. Typically it can be accessed with the parameter --help.

$ man --help → Display information about the command man.
$ ls --help   → Display information about the command ls.

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