命令线显示所选单位和其上级与下级单位之间的关系。
Command Lines indicate the relationship between the selected unit and its superior and subordinate units.
在以上的管道线中，我们在开始时使用一些生成输出的命令，然后通过管道线的每个阶段导出输出。
In the above pipelines we started with some command that generated output and then piped that output through each stage of the pipeline.
您可以通过添加更多的命令和管道操作符来构造更长的管道线。
You construct longer pipelines by adding more commands and more pipe operators.
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