Linux Basic Tutorial 41-system shutdown and restart

? ? In Linux, there are at least 5 commands related to shutdown and restart,shutdown, Halt, Poweroff, reboot, and Init. The individual commands function as follows:

Command	Description
Shutdown	Can be used to shut down and restart the computer. Support Timing and notifications
Halt	Stop the system
Poweroff	Shutdown
Reboot	Rebooting the system
Init	Init 0: Shutdown, init 6: Restart

Shutdown

Common usage is as follows:

shutdown [选项] 时间 [消息]

The common options are as follows

Options	Description
-R	Restart the system after it is stopped
-H	Shut down after the system stops
-C	Cancel shutdown
-K	Sends a warning message and disables login. Off is not really to shut down the machine
-P	After the system is stopped and power is turned off

Halt

Common usage is as follows:

halt [选项]

The common options are as follows

Options	Description
-F,--force	Enforces halt or reboot without calling shutdown
-P,--poweroff	Equivalent to Poweroff
-W,--wtmp-only	Writes shutdown records to the/var/log/wtmp file only, without actually shutting down or restarting the computer
-D,--no-wtmp	Do not write shutdown records to the Wtmp file

Poweroff

Common usage is as follows:

poweroff [选项]

The common options are as follows

Options	Description
-P,--poweroff	Shut down the machine
--reboot	Rebooting the system
-F,--force	Force shut down the machine
-W,--wtmp-only	Writes shutdown records to the Wtmp file only, without shutting down or restarting the computer
-D,--no-wtmp	Do not write shutdown records to the Wtmp file

Reboot

Common usage is as follows:

reboot [选项]

The common options are as follows

Options	Description
-P,--poweroff	Shut down the machine
--reboot	Restarting the machine
-F,--force	Forcing the machine to restart
-W,--wtmp-only	Only the restart record is written to the wtmp file without shutting down or restarting
-D,--no-wtmp	Do not write the restart record to the Wtmp file

Init

Common usage is as follows:

reboot [选项] [命令]

The common options are as follows

Options	Description
--help	Display Help information
--no-wall	Do not send messages until shutdown and restart

The common commands are as follows:

Command	Description
0	Shut down the machine
6	Restarting the machine

Usage examples

# 立即关机[[email protected] system]# shutdown -h now# 立即重启[[email protected] system]# shutdown -r now# 在指定时间重启[[email protected] system]# shutdown -r 19:30# 在3分钟后关机[[email protected] system]# shutdown -h +3# 关机并关闭电源[[email protected] system]# halt -p# 关机但不写记录[[email protected] system]# halt -d# 测试关机[[email protected] system]# halt -w# 重启系统[[email protected] system]# reboot# 关机并关闭电源[[email protected] system]# poweroff# 重启[[email protected] system]# init 6# 关机[[email protected] system]# init 0

In the above command, when using man to view the help, you will find halt, Poweroff, reboot are the same, the other three commands is a program, as follows:

Shutdown and restart summary

• Shutdown-r is used to restart, equivalent to reboot
• Shutdown-h-P is used to shut down the system and power off, equivalent to Poweroff
• Poweroff equivalent to Halt-p
• The shutdown-h is used to shut down the system, but not power off, equivalent to halt
• The main difference between shutdown and Reboot/halt is that shutdown sends a shutdown or restart notification message to the user who is logged on to the system
• Shutdown-k only for test shutdown
• Init relies on the native init system, in which case the shutdown has a runlevel of 0 and a restart of 6

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Linux Basic Tutorial 41-system shutdown and restart