Recently at OneLogin we decided to prune and purge all merged branches in one of our large Git repos. Having never had to do this with more then a handful of branches, I had relied on the GitHub branches UI.

This UI is less than ideal when working with over about a dozen branches, so I started looking into scripts to help automate the process.

The best information I found was in this StackOverflow question:

http://stackoverflow.com/questions/6127328/how-can-i-delete-all-git-branches-which-are-already-merged

I'll cut right to it.

Delete branches not merged into currently checked out branch on LOCAL

git branch --merged | grep -v "\*" | xargs -n 1 git branch -d

Prune your origin

git remote prune origin

Delete branches not merged into currently checked out branch on ORIGIN

git branch -r --merged | grep -v master | sed 's/origin\//:/' | xargs -n 1 git push origin

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