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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The ERR goes with the signal list within the trap command. In the following example, a non-existent file is copied, which invokes an error

ERR 在 trap 命令中提供了一个信号列表。

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