Listing 4 shows the beginning of the sample wrapper script, which defines a usage message that displays if you execute the script with no arguments or the wrong number of arguments.

清单4给出了此示例包装器脚本的开始部分，其中定义了一个使用消息，如果在没有参数或参数数量错误的情况下执行该脚本，就会显示这个消息。

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Often, you can trace the origin of a bug back to a caller that's sending the wrong type of argument, the wrong number of arguments, or a mismatch between the order of actual and formal arguments.

常常可以发现bug的原因是调用者发送了类型错误的参数或数量错误的参数，或者实际参数和形式参数的次序不匹配。

youdao

Often, you can trace the origin of a bug back to a caller that's sending the wrong type of argument, the wrong number of arguments, or a mismatch between the order of actual and formal arguments.

常常可以发现bug的原因是调用者发送了类型错误的参数或数量错误的参数，或者实际参数和形式参数的次序不匹配。

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