创建索引最直截了当的方式，就是采用可以运行查询的命令行接口。
The most straightforward way to create indexes is using a command line interface that allows queries to be run.
可以通过输入内容实现几乎所有功能，而且命令行工具对于它们的运行方式通常能够提供极好的控制。
You can accomplish almost anything by typing things out, and command-line tools will often provide an unprecedented degree of control over how they can be run.
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。
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.
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