Here is an example of executing a simple command that doesn't return a set of results.

以下是执行某个不返回结果集的简单命令的例子。

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The variable "$?" provides the return code of the command recently invoked; in the example below, it provides the return code of the execution of the "ls" command.

变量 "$?" 提供最近所调用命令的返回码；在下面的示例中，它提供了执行 "ls" 命令的返回码。

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For example, in Listing 3, you have the structure CommandOption associated with a user command argument, which is what the in_word_set routine would return.

例如，在清单3中，将CommandOption结构与用户命令参数关联起来，该参数将由in _ word_set例程返回。

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