Safely remove local fully merged branches

git-remove-branches

#!/bin/bash

# This has to be run from master
git checkout master

# Update our list of remotes
git fetch
git remote prune origin

# Remove local fully merged branches
git branch --merged master | grep -v 'master$' | xargs git branch -d

# Show remote fully merged branches
echo "The following remote branches are fully merged and will be removed:"
git branch -r --merged master | sed 's/ *origin\///' | grep -v 'master$'

read -p "Continue (y/n)? "
if [ "$REPLY" == "y" ]
then
   # Remove remote fully merged branches
   git branch -r --merged master | sed 's/ *origin\///' \
             | grep -v 'master$' | xargs -I% git push origin :%
   echo "Done!"
   say "Obsolete branches are removed"
fi

echo "Please, tell your teammates to run 'git remote prune origin' command in order to clean their local repository"

If you want to detect squash merges and the likes as well, git-delete-merged-branches may be of interest.