获取命令帮助:man 0 个改进

几乎任何命令之前输入 man,来显示该命令的帮助手册(用q退出man):

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  is  speci-
        fied.

        Mandatory  arguments  to  long options are mandatory for short options
        too.
...

参考:https://dev.to/awwsmm/101-bash-commands-...

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