man – Format and display the ‘MAN’ual pages.

Summary

Most of the commands are comes with a specially formatted manual,
which explains “how to use the command, option list, etc..”.
‘man’ command is used to view those manual page.

Man pages are sorted in categories, as mentioned below:

1. Executable programs / Shell commands
2. System calls
3. Library calls
4. Special files
5. Config file formats and conventions
6. Games
7. Miscellaneous
8. System administration commands
9. Non-standard

Examples

$ man man  #Display the manual page of the man command

$ man ls  #Display the manual page of the ls command

$ man printf  #Display printf command man page.