我也很喜欢使用spray命令对可能的问题进行故障排除。
I also like to use the spray command to troubleshoot possible problems.
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.
不幸的是，关于使用GRUB 2的命令行模式进行故障排查的详细描述内容，其长度将会是本文的好几倍。
Unfortunately, a complete description of troubleshooting using GRUB 2's command-line mode would be several times the length of this article.
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