Delete all git branches that are gone from origin

git-delete-not-tracked-branches.sh

#!/bin/bash

#git fetch --prune # run fetch --prune to update local refs that were removed on orign

BRANCHES=$(git branch -r | awk '{print $1}' | egrep -v -f /dev/fd/0 <(git branch -vv | grep origin) | awk '{print $1}')

echo Branches that are gone on origin:
echo $BRANCHES | tr " " "\n"

read -p "Delete these branches (y/n)? " answer

if [ "$answer" = "n" ]; then echo aborting && exit; fi

echo $BRANCHES | xargs -n 1 git branch -D