powerfail：只在init收到电源故障信号时执行命令。
Powerfail: Only execute the command if init receives a power fail signal.
提出了一种随机共振自适应算法，并运用于中频电源故障信号检测，取得了较好的效果。
A random resonance self-adaptive algorithm is stated and used for fault signal detection in medium frequency power supply with good result.
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.
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