How to config Git remote server on Bitbucket or Github

For your first push with git, you may get following errors when you use github or bitbucket.

$ git push
No refs in common and none specified; doing nothing.
Perhaps you should specify a branch such as 'master'.
fatal: The remote end hung up unexpectedly
Everything up-to-date

Just run following command to set your remote upstream to be master branch.

git push --set-upstream origin master