You can pass command line arguments to a program, thereby allowing multiple variations of the query to be run with a single program.
您可以将多个命令行参量传到程序中，这样可以运行一个程序可以进行多种类型的查询。
If you use the time variable, the single line set time at the start of the script is good enough to display the time it takes to run individual commands.
如果使用time变量，那么只需在脚本的开头加上一行set time，就可以显示各个命令的执行时间。
It can be run in one of two ways, either with a single command line argument, which should be an errno value, or without any arguments.
它能以两种方式之一运行，带单个命令行参数，该参数应该是errno值，或不带任何参数。
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