命令行的语法错误。
In case of any error executing the command, an exception should be set in the command result.
如果在执行命令时发生了任何错误,则应在命令结果中设置异常。
If you just used the command as in Listing 16, then you would get an error.
如果您像清单16那样使用该命令,那么将得到一个错误。
So generally, if you don't get an error message in a command line environment like this, that's good.
一般来说,如果你在命令行界面,没有收到错误信息,那就是好消息。
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