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。
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。
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