Common Linux commands (4) -- help commands

Common Linux commands (4) -- Help Command 1. Command name: man www.2cto.com execution permission: All Users Function Description: Get help Syntax: man [command or configuration file] views the help information of the ls command. When the help information is displayed, press the 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 ~] # If man services has the same name as the configuration file, 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 Syntax: info [any keyword] [root @ localhost ~] # Info ls 3, whatis, apropos, and -- help execution permissions: All Users Function Description: Get the 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 user features Description: view the help Syntax of shell built-in commands: help Command [root @ localhost ~] # Help cd