Simple commands to log off, shut down and restart under linux operating system

1. Logout command——Logout is a relative operation of login. After logging in the system, if you want to leave the system, the user only needs to directly issue the logout command: 
[root@laolinux root]# logout 
2. Shutdown or restart command—— shutdown 
shutdown command can close all programs, restart or shutdown. 
The parameter descriptions are as follows: 
Shutdown immediately: The -h parameter makes the system shut down immediately. The example is as follows: 
[root@laolinux root]# shutdown –h now ——” Request the system to shut down immediately and 
specify the shutdown time: the time parameter can specify the shutdown time; 
or set the time after which the shutdown command is run;  
for example: 
[root@laolinux root] # shutdown now ——"Shut down immediately 
[root@laolinux root]# shutdown +5 ——"Shut down after 5 minutes  [root@laolinux root]# shutdown 10:30 ——" Automatic restart after
shutdown at 10:30  :
The -r parameter sets restart after shutdown.  
For example: 
[root@laolinux root]# shutdown -r now ——"Shut down the system immediately and restart 
[root@laolinux root]# shutdown -r 23:59 ——"Specify restart at 23:59 
3. Restart the computer command --reboot 
The reboot command is used to restart the system. The commonly used parameters are as follows: 
-f parameter: Shut down without following the normal procedure, directly shut down the system and restart the computer. 
-I parameter: Shut down all network interfaces before rebooting. 
Although the reboot command parameters can be used, generally just enter reboot.