The significance of the field number in man

Here are the notes for reading laruence's private dishes. When using man:

For example, [Samson @ Samson ~] $ MAN 2 time

The following are the statements in laruence's book:

Meanings of common numbers:
1. commands that users can operate or executeProgram
2. adjustable functions and tools at the system core
3. Some common functions (C function library)
4 Device File description
5. Format of device files or some files
6 Games
7. Conventions and protocols, such as Linux standard file systems, network protocols, and ascll Codes
8. management commands available to the system administrator
9. kernel-Related Files

In the fedora 12 system, the following information about man's help information is as follows:

Manual sections
The standard sections of the manual include:

1 USER commands

2 system CILS

3 C library functions

4 devices and special files

5 file formats and conventions

6 Games et. al.

7 Miscellanea

8 system administration tools and deamons