1、设置Git的user name和email：(如果是第一次的话)

    $ git config --global user.name "name"
    $ git config --global user.email "youremai@qq.com"

2生成密钥

   $ ssh-keygen -t rsa -C "youremai@qq.com"

回车后会要输入信息，连续输入3个回车。如果不需要密码的话。最后得到了两个文件：id_rsa和id_rsa.pub。

3 复制密钥

打开id_rsa.pub文件，复制里面的密钥

4 配置github

进入github官网并登录，找到settings--》SSH and GPG keys-->new SSH key，最后把复制的密钥复制进去

5 测试

    $ ssh -T git@github.com

你将会看到

 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)?

选择yes，看到如下结果表是配置成功

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