Power fail signal的意思|示意

Powerfail: Only execute the command if init receives a power fail signal.

powerfail：只在init收到电源故障信号时执行命令。

Powerwait: Only execute the command if init receives a power fail signal, and wait until the process terminates before continuing to scan the inittab file.

powerwait：只在init收到电源故障信号时执行命令，并且等待进程终止后再继续扫描inittab文件。

According to an initial investigation, a sudden loss of power caused the signal system to fail, forcing the trains to be operated manually, Shanghai Shentong Metro Group Company said in a statement.

上海申通地铁集团公司在一次声明中称，根据初步排查，电力突然中断致使地铁运营信号系统失灵，导致不得不对列车实行人工调度。