This can be restated as follows: the program should operate the same, irrespective of its source of input (a file, a pipe, or the terminal) and of its output destination.

该特性可以重新叙述如下：不管程序的输入源(文件、管道或终端)和输出目的地是什么，程序都应该以同样的方式工作。

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By parsing this output file, you can determine the changes between the source directory and destination reference directory.

通过解析这个输出文件，可以判断出源目录和目标参照目录之间的差异。

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For example, the file ownership and group ownership Settings can only be preserved if the source and destination machines use the same IDs for the same user.

例如，只有在源和目标计算机对相同用户使用相同id的情况下，才能保留文件所有者和组所有者设置。

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