Linux Man Pages: Main Sections

0C Library Header Files
1General Commands
2System Calls
3C Library Functions
4Special Files: Devices, Drivers, ...
5File Formats and /proc Description
7Conventions, Miscellanea
8System Administration Commands and Daemons
9Kernel Routines


Sections: 1, 2, 3, 4, 5, 6, 7, 8

Some Extras Sets of Pages:

Perl stuff, ViewOS, ... (probably coming soon)