命令行ssh -T git@, 遇到如下错误：
git@: Permission denied (publickey).
用户文件夹.ssh下找到文件id_rsa.pub:
用记事本打开，拷贝全部内容。
登录Github，新建一个ssh key：
将id_rsa.pub的内容拷贝进去：
重新执行ssh -T git@，成功了：
Warning: Permanently added the RSA host key for IP address ‘13.250.177.223’ to the list of known hosts.
Hi wangzixi-diablo! You’ve successfully authenticated, but GitHub does not provide shell access.
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