Linux command (+): Help command

Help command

functional description

The help command can only display command assistance information inside the shell . The Help for external commands can only be viewed using the man or Info command, and you can use the--HELP command to display the command's usage information. Use the following:

Help (options) (parameters)

Command parameters

Options	Meaning
-D	Output a short description of each topic
-M	show how to use the Man Handbook format
-S	Display simple Help information

Example

Use Help to display internal CD commands

[[email protected] ~]# type cd #查看cd是内嵌命令 The CD is a shell embedded [email protected] ~]# help cd #查看cd帮助信息 CD:CD [-l|[ -P [-e]] [dir] Change the shell working directory. Change the current directory to DIR. The default DIR is the value of the HOME Shell variable. ... Slightly [[email protected] ~]# help-d cd #使用-D option to view a short description of the command Cd-change the shell working directory. [[email protected] ~]# help-m cd #使用-M option, view in Man manual NAME Cd-change the shell working directory. Synopsis CD [-l|[ -P [-e]] [dir] DESCRIPTION ... Slightly [[email protected] ~]# help-s CD #使用-S option, simple help information CD:CD [-l|[ -P [-e]] [dir]

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Linux command (+): Help command