功能描述
查看命令手册，手册分为以下8类，即man1-man8
- General commands
- System calls
- Library functions, covering in particular the C standard library
- Special files (usually devices, those found in /dev) and drivers
- File formats and conventions
- Games and screensavers
- Miscellanea
- System administration commands and daemons
实例
# 查看系统调用syscalls帮助
man 2 syscalls
-k
正则搜索全部的man页面