当列值发生改变时，行处理中断并执行COMPUTE命令中指定的动作，然后执行BREAK命令中指定的SKIP动作。

When the column value changes, row processing breaks and performs the actions specified in the COMPUTE command, and then the specified SKIP action in the break command is performed.

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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。

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

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我们应该使用一个单独的ioctl命令来对中断模拟进行控制(请参阅ioctl接口一节的内容)。

A separate ioctl command should be introduced to have control over interrupt simulation (see the section on the ioctl interface).

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