请查看：https://www.jianshu.com/p/ee678badb842
如果出现：fatal: remote origin already exists
就先删除已存在的：
$ git remote rm origin
再执行：
$ git remote add origin your_github_project_ssh_address
标签：origin,git,remote,Mac,Github,上将 From： https://www.cnblogs.com/johnnyzhao/p/17486392.html