权限定义谁可以访问给定文件、谁可以读取它、谁可以向其写入，以及谁可以执行它。

The permissions define who can access a given file, who can read it, who can write to it, and who can execute it.

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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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