首先我们更改. ssh目录的访问权，只允许所有者拥有读取、写入和执行的权限。

First, we change the access rights for the.ssh directory so that only the owner has read, write, and execute privileges.

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因此，只有root和usershare s组的成员能够使用这个目录；通过粘贴位设置，只有文件的拥有者才能够删除该文件。

Thus, only root and members of the usershares group can use this directory; by virtue of the sticky bit, only the owner of a file can delete the file.

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tar 实用程序将一个或多个文件和目录打包为单个文件，并保持原始文件的大小、拥有者、权限、文件类型及其在文件系统层次结构中的位置。

The tar utility bundles one or more files and directories into a single file, maintaining bytes, owners, permissions, file type, and station in the file system hierarchy of the original files.

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