man

We close this brief list with a command that provides detailed information about any Unix command. The command accesses online Unix documentation called “manual pages” or “man pages” for short. To learn more about the mv command, type

    man mv
Unfortunately the online documentation is not written with novices in mind. So if you are a beginner, it will probably take you a while to learn how to find what you want from the man pages. Then you will find this a very useful command.

The info command accesses mainly documentation for GNU software. It requires only a little effort to learn to navigate and has a self-tutorial.