添加第二个远程地址时使用以下命令：
git remote set-url --add origin git@github.com:morethink/programming.git
查看远程分支：git remote -v
origin git@git.coding.net:morethink/programming.git (fetch) origin git@git.coding.net:morethink/programming.git (push) origin hexo@MyHost2:/var/repo/gitbook.git (push)
也可以同时 push 到多个远程地址：git push origin master
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