git-remove-master-merged-branches.sh

#!/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!"
fi