This gist will create a custom git script that will delete any branches that are fully merged into the currently checked out branch (usually run on master)

git-bomb.sh

mkdir -p ~/scripts/git
echo 'git branch --merged | grep -wiv -e "main" -e "master" | xargs -n 1 git branch -d' > ~/scripts/git/git-bomb
echo 'git remote prune origin' >> ~/scripts/git/git-bomb
chmod +x ~/scripts/git/git-bomb
sudo ln -s ~/scripts/git/git-bomb /usr/bin/git-bomb

don't delete master -> 'git branch --merged | grep -v "\*\|master" | xargs -n 1 git branch -d'

@vormwald thanks! done.

It's been 7 years now and I still love this script. <3