Err . Returns the associated error number.
Err，返回相关的错误号。
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。
Factors that may lead to canine error are similar to those that cause humans to err in the workplace: fatigue and over-eagerness to please the boss.
有些因素可能会导致一些错误。就像人类在工作时犯的错误一样，如疲劳和过度取悦老板的心理。
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