Linux Shutdown related commands

First, the run-level definition of init

1,# init 0 system starts the rc0 script kills the running process, shuts down the operating system. Use the virtual machine test to shut down to the " shutdown " state;

2,# init 1 system kills the running process after booting into single user mode. With virtual machine testing you can see that the virtual machine is initialized to single-user mode and the remote user is out. Press ctrl+d(exit) to restart thedevice and restore to multi-user status;

3,# init 5 The system shuts down the operating system after it kills the running process. Using a virtual machine test, "however there is nothing Luan to use ", no shutdown operating system appears;

4,# intit 6 reboot .

ii.shutdown,poweroff,reboot order

1,shutdown used more commands in the shutdown action. The Shutdown is mainly completed by the following processes to complete the shutdown.

1, specify the shutdown time, and send a message to the user in use;

2, then run Init 0 to kill all processes;

3, run sync to synchronize the in-memory data to the hard disk;

4, the last call halt into the shutdown mode;

2,shutdown common Operation

1, through ---help view shutdown Common parameters

[[Email protected] ~]# shutdown --helpusage: shutdown [option]... time  [message]bring the system down. options: -r                           rebootafter shutdown -h                            haltor power off after shutdown -H                            halt after shutdown  (implies-h)  -P                          poweroff after shutdown  (implies -h)  -c                           cancela running shutdown -k                            onlysend warnings, don ' T shutdown  -q,--quiet                  reduce output  to errors only

2, example 1:

Window 1:[[email protected] ~]# shutdown 23:30 #直接加时间指明某刻关机. Broadcast message from [e-mail protected] (/DEV/PTS/2) at 22:56 ... The system is going down for maintenance in34 minutes! #如果想取消也可以按Ctrl +c cancel Shutdown:shutdown cancelled # #在另外一个终端使用-C parameter canceled

Window 2:[[email protected] ~] #Broadcast message from [e-mail protected] (/DEV/PTS/2) at 22:56 ... The system is going down for maintenance in34 minutes! #窗口1命令引起的消息 [[email protected] ~]# shutdown–c #在另外一个终端使用-C Cancel

3, example 2:

[Email protected] ~]# Shutdown # The system is going down for maintenance in30 minutes! [Email protected] ~]# Shutdown-r now # The system was going down for reboot now!

3,halt command

The halt command only completes part of the shutdown process, he does not notify the logged-on user, does not perform a kill operation, and immediately shutdown, if #halt is used –q Will immediately stop the system, no synchronization, no kill process or write logs, very dangerous.

[Email protected] ~]# haltbroadcast message from [e-mail protected] (/dev/pts/0) at 23:13 ... The system is going down for halt now!

4,poweroff command

The Poweroff command does not notify the logged-on user, does not perform a Kill script operation, immediately shutdown and power down. Commonly used in conjunction with the Sync command such as:#sync; reboot.

Third, Summary:halt,poweroff,reboot are more dangerous operations, generally do not recommend the use of these commands. Or you need to use "Sync" sync before using these commands .

When using shutdown, You can use the # shutdown now–k only to send a shutdown message and not to actually shut down the computer.

This article is from the "Ding classmate 1990" blog, please be sure to keep this source http://dingtongxue1990.blog.51cto.com/4959501/1687856

Linux Shutdown related commands