4.4. The manuals

Every UNIX system has online a complete set of documentation available with the command man. Type man man for more help on man :-) There are 9 manual sections:

1. general user commands and utilities
2. system calls
3. C functions and libraries
4. devices and drivers
5. file formats
6. games
7. misc.
8. system maintenance and operation commands
9. kernel interfaces

The standard notation is command(sec#), as in ls(1), which means "command ls, in section 1".