Command prompt and command format description for Linux systems

Start using CentOS:

Command prompt:

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[Email protected] ~]#

Root: The name of the user account that is currently successfully logged on to the system

localhost: The host name part of the current host name;

~: Working directory for current user operation, ~ meaning home directory

#: User's identity prompt

#: Represents the identity of super users

$: Indicates normal user identity

Format of the command:

COMMAND OPTIONS ARGUMENT

Command option Parameters

COMMAND: The action that you want to perform, the process that you want to initiate

Internal command: Also called BUILTIN command or built-in command, directly built with shell commands

External commands: Commands installed by installing certain applications

OPTIONS: An integral part of correcting the execution effect of a command

Short options:

-char

-a,-b,-i,...

Some special commands also have special short options:

+char

+c,...

When you use multiple short options at the same time, you can combine them in writing, such as:

-a-b-I. <=>-abi

Long options:

--word

--help,--all,--verbose,--list,...

Note: It is not possible to combine writing when there are multiple long options in one command;

Attention:

1, some options, the options themselves need parameters;

2, some special commands in the writing options, you can not write "-"; some special commands, when writing options, must not write "-";

3, some special command of the long option, can only use a "-";

ARGUMENT (PARAMETERS): Object of the operation target of this execution command

Note: 1, some commands do not need to write parameters;

2, some commands must write parameters;

3, some commands must write several parameters;

For the entire command format:

Note: 1. The command, OPTIONS, and agument must be spaced with at least one white-space character when writing the order format;

2. In the execution of some orders, options and agument can exchange positions;

3. Due to the limitation of the file system, the command part, the options part and the agumrnt part of the order must be case-sensitive.

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There must be spaces (at least one space) between commands, adding options and parameters to decorate and adjust the commands to show more accurate results.

Simple System Management Class commands:

Logout: Just log out, other programs may not be interrupted

Exit

Logout

Ctrl+d

Reboot: will run in memory so the process shuts down, shuts down the system kernel, recharges all computer parts, loads the kernel, launches the application, prints the login prompt

Reboot

Shutdown-r (reboot)-T (time, reboot after how many minutes) #|now|time (recommended)

#: number that represents the relative time, which is the # minute after reboot

Now: Reboot immediately, equivalent to--T 0;

time:12:00

Init 6

Shut down the system: shuts down all processes running in memory, shuts down the system core, and loses power to all computer components

Halt

Poweroff

Init 0

shutdown-h {#|now|time} (recommended)

This article mainly introduces, Basic command format and simple format introduction.

Command prompt and command format description for Linux systems