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。
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。
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