除了特定的用户所有者，每个文件和目录还具有一个组所有者。

In addition to a specific user owner, every file and directory also has a group owner.

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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。

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.

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这些属性包括文件所有者及组权限，访问控制列表(acl)，以及扩展文件属性。

These attributes include file owner and group permissions, access-control lists (ACLs), and extended file attributes.

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