Common Linux commands (4)-Help commands

1. Command name: Man

Execution permission: All Users

Function Description: Get help information

Syntax: Man [command or configuration file]

 
View the help information of the LS command. After the help information is displayed, Press space to next page, press Enter next line, and press Q to exit [root @ localhost ~] # Man ls: view the help information of the configuration file services. After the help information is displayed, press the space on the next page, press Enter next line, and press Q to exit [root @ localhost ~] # Man services
 

If the command and configuration file have the same name, man displays the help information of the command by default. You can use man 5 to specify the help information of the configuration file, for example, MAN 5 passwd.

 

2. Command name: info

Execution permission: All Users

Function Description: Get help information

Syntax: info [any keyword]

[Root @ localhost ~] # Info ls
 

 

3. Whatis, apropos, and -- Help

Execution permission: All Users

Function Description: Get Brief description of the index.

Syntax: whatis [any keyword], apropos [any keyword], command -- Help

[Root @ localhost ~] # Apropos fstabendfsent [getfsent] (3)-handle fstab entriesfstab (5)-static information about the filesystemsfstab-Decode (8)-run a command with fstab-encoded encode (3) -Handle fstab entriesgetfsfile [getfsent] (3)-handle fstab entriesgetfsspec [getfsent] (3)-handle fstab entriesnfs (5) -fstab format and options for the NFS file systemssetfsent [getfsent] (3)-handle fstab Entries [root @ localhost ~] # Whatis lsls (1)-List Directory contentsls (1 p)-list directory contents [root @ localhost ~] # [Root @ localhost ~] # Ls -- Help
 

 

4. Command name: Help

Execution permission: All Users

Function Description: view the help of shell built-in commands.

Syntax: Help Command

 
[Root @ localhost ~] # Help CD