Linux Common commands help command __linux

Linux to view system commands, shell built-in commands, system configuration file help information. Linux help document distinguishes types; 1 stabilizing the Help for the command 5 for the help document for the configuration file

One View system command help

1. Man command: View detailed help information for a command

　　　1. Command format: man command

　　　2. Command example: man ls

　　　3. Sub-command: after entering the man command, you can use the following subcommand:

Page Flip: pageUp Up, pageDown down, space down, P return to the first page

Flip: Arrow down the line, the arrow down the line, Enter down the line

Find:/str find string str, press N Next

Exit: Q

　　2. Whatis command: View command cut SMS

　　　1. Command format: whatis command

　　2. Common examples: whatis ls

　　3.--help: View commands common options

　　　1. Command format: command--help

　　　2. Common examples: ls--help

Two view system configuration file Help

　　1. Man: View configuration file details Help information

　　1. Command format: man 5 configuration file name

　　2. Common examples:man 5 passwd

　　2. Apropos: View profile cut SMS

　　　1. Command format: apropos configuration file

　　　2. Common examples: apropos Inittab

three view Shell built-in command help:

　　1. Command format: help Shell built-in command

　　2. Common examples: help if

Linux does not provide a command to view all of the shell's built-in commands and can be viewed through the man shell built-in commands, such as Man If, man CD, etc.