One of the most fundamental, yet useful commands that the user can enter via CLI is ‘man’. The ‘man’ command calls up the manual page for the designated command. Unix/Linux OS X systems are loaded in most cases with a set of ‘manual pages’ for the various commands that the respective systems support.
So for instance if I go to the Terminal on my Mac (Go >> Utilities >> Terminal) and type in ‘man man’, I will get the manual page for the man command. To leave the man page display, just enter ‘q’.
This provides a quick way to find out what a command does, verify
the syntax to use and see what options are available.
See my other CLI articles