我们看到，用于列出目录内容的ls命令是一个别名。
We saw that the ls command, used for listing directory contents, is an alias.
目录的读权限允许用户使用该权限列出目录内容。
Read permission for a directory allows a user with that permission to list the contents of the directory.
最后，在列出目录内容时，可以按照文件的最后修改时间进行排序，这样做有时很有帮助。
Finally, it's sometimes helpful when listing the contents of a directory to view the files sorted by their time of last modification.
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