sudo apt-get install ssh

cd ~/.ssh

看看存不存在.ssh，如果不存在的请看下一步。

首先输入下面的命令，使用你在注册github时使用的Email生成一个SSH公钥私钥对

$ ssh-keygen -t rsa -C "your_email@youremail.com"

Generating public/private rsa key pair.
Enter file in which to save the key (/home/you/.ssh/id_rsa):

同时在自己的目录下，有一个.ssh目录，说明成功了

Enter passphrase (empty for no passphrase): [Type a passphrase]
Enter same passphrase again: [Type passphrase again]

id_rsa  id_rsa.pub  known_hosts

打开github，找到账户里面添加SSH，把id_rsa.pub内容复制到key里面。

使用下面的命令测试

ssh -T git@github.com

当你看到这些内容放入时候，直接yes

The authenticity of host 'github.com (207.97.227.239)' can't be established.
RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
Are you sure you want to continue connecting (yes/no)?

看到这个内容放入时候，说明就成功了。

Hi username! You've successfully authenticated, but GitHub does not
provide shell access.