1、帮助命令man
man 命令
#获取制定命令的帮助
man ls
#查看ls的帮助
运行效果:
[root@localhost ~]# man ls
LS(1) User Commands LS(1)
NAME
ls - list directory contents
SYNOPSIS
ls [OPTION]... [FILE]...
DESCRIPTION
List information about the FILEs (the current directory by default).
Sort entries alphabetically if none of -cftuvSUX nor --sort.
&nb