source destination file

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。

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。

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。