See no merged branches on git

So you're working on your project and want to see which features were not yet merged into the master branch. Do not fear, just checkout to master and run the following command:

git branch --no-merged master

And voilá! You'll have a list of which branches were not yet merged into your master. You can even create an alias:

git config --global alias.nm "branch --no-merged"

and then just run

git nm master

Hope it helps you :)

Related protips:

fatal: refusing to merge unrelated histories