The v, f, and p options specify verbose output (prints the files being added/extracted), writes/reads from a file (instead of a tape device), and retains permissions and ownership, respectively.
f 和 p 选项分别指定输出详细信息（显示正在添加或提取的文件）、对文件（而不是磁带设备）进行写入/读取、保持权限和所有权。
In this mode, it is not necessary to specify -v to show default values.
在该模式下，没有必要指定- v来显示默认值。
You won't need to specify the -v flag on subsequent connections; but it is quite useful to do so while testing a connection.
在后续连接中不必指定- v标志，但该选项对测试连接颇为有用。
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