命令打印出当前目录下的所有文件和目录列表。

The find . command prints out the list of all files and directories in the current directory and under.

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shift从参数列表中删除所有已处理的参数，保留待处理的文件和目录列表。

Shift removes all the processed arguments from the argument list, leaving the list of files and directories to process.

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同样，和前一个列表相同，它与该目录中的任何文件的时间戳都不同。

Also, as in the previous listing, it is different from the timestamps of any of the files in the directory.

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