Git Push.default is unset

Warning:push.default is unset; Its implicit value was changing in
Git 2.0 from ' matching ' to ' simple '. To squelch the This message
and maintain the behavior after the default changes, use:

git config--global push.default matching

To squelch this message and adopt the new behavior now, use:

git config--global push.default simple

Matching

The ' matching ' parameter is the default behavior of Git 1.x, which means that if you perform a git push without specifying a branch, it will push all your local branches to the corresponding matching branch in the remote repository.

Simple

The default for Git 2.x is simple, meaning that when you do not specify a branch for git push, only the current branch will be push to the code you get using git pull.

Modify default Settings

From the above message hint, we can modify the global configuration so that it does not prompt each push. For matching, enter the following command:

git config--global push.default matching

For simple, please enter:

git config--global push.default simple

Source: Http://www.oschina.net/news/45585/git-2-x-change-push-default-to-simple

Git Push.default is unset