man Pagesman (short for "manual") pages are the Unix/Linux way of documenting things.
This is a mirror of the ones that apply to file formats.
| Section | Description | 
|---|---|
| 1 | User commands that may be started by everyone. | 
| 2 | System calls, that is, functions provided by the kernel. | 
| 3 | Subroutines, that is, library functions. | 
| 4 | Devices, that is, special files in the /dev directory. | 
| 5 | File format descriptions, e.g. /etc/passwd. | 
| 6 | Games, self-explanatory. | 
| 7 | Miscellaneous, e.g. macro packages, conventions. | 
| 8 | System administration tools that only root can execute. | 
| 9 | Another (Linux specific) place for kernel routine documentation. | 
| n | (Deprecated) New documentation, that may be moved to a more appropriate section. | 
| o | (Deprecated) Old documentation, that may be kept for a grace period. | 
| l | (Deprecated) Local documentation referring to this particular system. | 
man pages, from Harvey Mudd College.--help and --version output