The trap command prevents the script from being interrupted by the user (by pressing control-C during boot, for example) while the script executes.

trap命令防止用户在脚本执行时中断(例如，在引导时键入control - c)脚本。

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To do so, enter Control-C in the console where you started the application.

要这么做，在启动应用的控制台中输入Control - C。

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If you need to shut down the server, type control-c at the console.

如果需要关闭服务器，那么在控制台中输入control - c。

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It turns out that in a lot of languages, C included, you the programmer knowing a bit about how the computer works and the language works, can exercise more fine-grained control.

结果在包括C语言的很多语言当中，你作为一个程序员懂得了一些计算机的工作方式,和语言的处理方式，可以更精确地控制运用它。

哈佛公开课 - 计算机科学课程节选

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