Before we begin, you should have a basic idea of working at the command line.
在开始之前，应该掌握一些在命令行下工作的基本知识。
You have to use at least one switch in order for the command to do anything.
你必须至少使用一个开关，以便为命令做任何事情。
You have to use at least one switch in order for the command to do anything.
你必须至少使用一个开关，以便为命令做任何事情。
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