Help commands for common linux commands and common linux commands

Help commands for common linux commands and common linux commands

1.TypeThe difference between built-in and external commands

2.BashEnter bash to use help in bash.

3.Help lsLs is an external command, help can only view the built-in command methods, cd is a built-in command

Ls -- helpAvailable

4.Man lsMan does not distinguish between built-in or external commands, and is more comprehensive than help, help is more concise

5.Info lsSome environments do not have info. bash generally comes with info, which is more comprehensive than man.

When necessary, we can use help commands to make our work more efficient ~