下面指的是手册的章节号：

1   General commands通用命令

2   System calls系统调用

3   Library functions, covering in particular the C standard library库函数

4   Special files (usually devices, those found in /dev) and drivers特殊文件和驱动

5   File formats and conventions文件格式和惯例

6   Games and screensavers游戏相关、屏保

7   Miscellanea杂项

8   System administration commands and daemons系统管理命令和后台

比如可以通过输入man 8 mount