1、 ssh-keygen -t rsa -b 4096 -C "邮箱"
命令行输出：
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/liuhongliang/.ssh/id_rsa)：此处为了方便直接按回车，防止后面出现错误不知道怎么解决
Enter passphrase (empty for no passphrase): 输入你的证书密码，验证时会用到
Enter same passphrase again: 确认密码
2、eval "$(ssh-agent -s)"
3、ssh-add -K ~/.ssh/id_rsa
此时已经生成了。
验证
4、ls -al ~/.ssh
输出
staff 170 5 18 14:42 .
staff 1394 5 18 14:27 ..
staff 3326 5 18 14:42 id_rsa
staff 742 5 18 14:42 id_rsa.pub // - 如果有它表示成功了
staff 407 5 18 14:24 known_hosts
5、pbcopy < ~/.ssh/id_rsa.pub // 拷贝公钥
6、 到github网站，
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