先给出正确命令：
ssh-keygen -t rsa -C "zhangsan" --这里填github登录名而不是邮箱
网上找的命令执行报错：
错误信息：Could not resolve host: github.com...
开始排查问题：
1.发现github.com浏览器可以访问但ping不通，开启VPN连到墙外依然ping不通
2.度娘之，看到修改hosts文件指定github.com IP的办法，结果错误依旧
3.最终找到正确命令，执行，成功
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