linux man page sections
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1 User commands (Programs)
Commands that can be executed by the user from within a shell.
2 System calls
Functions which wrap operations performed by the kernel.
3 Library calls
All library functions excluding the system call wrappers (Most
of the libc functions).
4 Special files (devices)
Files found in /dev which allow to access to devices through
the kernel.
5 File formats and configuration files
Describes various human-readable file formats and
configuration files.
6 Games
Games and funny little programs available on the system.
7 Overview, conventions, and miscellaneous
Overviews or descriptions of various topics, conventions and
protocols, character set standards, the standard filesystem
layout, and miscellaneous other things.
8 System management commands
Commands like mount(8), many of which only root can execute.
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- Section # 1 : User command (executable programs or shell commands)
- Section # 2 : System calls (functions provided by the kernel)
- Section # 3 : Library calls (functions within program libraries)
- Section # 4 : Special files (usually found in /dev)
- Section # 5 : File formats and conventions eg /etc/passwd
- Section # 6 : Games
- Section # 7 : Miscellaneous (including macro packages and conventions),
- Section # 8 : System administration commands (usually only for root)
- Section # 9 : Kernel routines [Non standard]