man命令
该命令可以显示指定命令的用法和描述,比如你入锅想知道ls命令的用法和选项,可以在终端执行“man ls”:
语法:man <command name>
man ls
root@devopscube:man ls
LS(1) User Conmands LS(1)
ls - list directory contents
SYNOPSIS
ls [OPTION]...[FILE]...
DESCRIPTION
List information about the FILES(the current directory by default).
Sort entries alphabetivcally if none of -cftuvSUX nor --sort is speciafiled
Mandatory arguments to long options are mandatory for short options too.
-a,--all
do not ignore entries starting with.