当节点重启、关机、崩溃或使用mkdev和rmdev等命令时会触发此事件。
This event is triggered when a node is rebooted; shutdown, crashes or with commands like mkdev and rmdev.
这是一张备忘单的关机命令(有休眠、锁定、准备…)，重启和注销。
This is a cheat sheet of commands for shutdown (hibernate, lock, stand by...), reboot and logoff.
说明：重启、注销、待机、关机、关闭电源和休眠。代码中含有详细的注释，一看就懂。
Restart, logoff, standby, shutdown, power off and sleep. Code contains detailed notes, a look to understand.
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