After the trap has been set, define two variables to ease the typing later in the script.

在设置了陷阱之后，定义两个变量以便稍后在脚本中键入时使用。

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You also need to be able to trap errors and output from programs and ensure the security and validity of the environment in which the script executes.

还需要能够跟着错误和程序输出，并需要能够确保脚本的执行环境的安全性和有效性。

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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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A message displays containing the line number and command when the trap was caught; the script then exits (from the exit command on the trap command list).

在捕捉到trap后，会显示一条包含行号和命令的消息；脚本随后将退出执行(使用trap命令列表中的exit命令)。

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A message displays containing the line number and command when the trap was caught; the script then exits (from the exit command on the trap command list).

在捕捉到trap后，会显示一条包含行号和命令的消息；脚本随后将退出执行(使用trap命令列表中的exit命令)。

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