Listing directory contents（列出目录内容） Changing file permissions and attributes（更改文件的权限和属性） .
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We saw that the ls command, used for listing directory contents, is an alias.
我们看到，用于列出目录内容的ls命令是一个别名。
Let's improve the code in Listing 2 to show the contents of a directory before descending further into any subdirectories.
让我们对清单2的代码稍加改进，在将目录转变为任何子目录之前展示它的内容。
Finally, because the source directory may have files that have been deleted from the original, any deleted files are also removed from the encrypted directory contents (see Listing 8).
最后，因为源目录中可能有已经删除的文件，还要把删除的文件从加密目录内容中删除(见清单8)。
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