3rd Linux Common Commands (6) _ Shut Down restart command

8. Power off restart command

8.1 Power off restart command

(1) Shutdown [option] Time

① Options

- C : Cancels the previous shutdown command

- H: turn off the machine

- R : Restart

Examples of ② applications: #shutdown –h now, Shutdown–h 20:30

(2) Other shutdown commands

　①halt②poweroff③init 0

(3) Other restart command :①reboot②init 6

8.2 system Run Level

(1) operating level (can be viewed through Cat/etc/inittab)

Level	Meaning	Note
0	Shutdown	such as Init 0. cannot be set to the default level.
1	Single user (only the root user can log in)	Only start the core service, generally used for repair operations
2	Not fully multi-user, no NFS service included	command line mode, no network function
3	Full Multi-user	Command-line mode
4	Not assigned
5	Graphical interface	Xwindow
6	Restart	such as Init 6. cannot be set to the default level.

(2) Modify the system default operating level

#Cat /etc/inittabID:3: initdefault:    // set Default level to 3

(3) Check the operating level of the system:

#runlevel   // view runlevel: Displayed as n 3 (where n indicates the previous level, here is None, 3 represents the current runlevel)5     /// toggles the run level to 5, which is displayed as 3 5, which represents the previous 3 and is currently 5.

8.3 Exit Login Command

(1) Logout

(2) Ctrl+d

3rd Linux Common Commands (6) _ Shut Down restart command