The man command is used to display help information, which means manual , that is, the help manual. When you don’t know a certain command, using man is the best way, and the information you see is the most standard.
Syntax format: man [parameter] object
Common parameters:
Example
# 查看ifconfig的使用帮助man ifconfig
# 编号规则：普通命令为1，函数为2，库文件为3，设备为4，配置文件为5，游戏为6，宏文件为7，系统命令为8，内核程序为9，TK指令为10 man 5 passwd
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