A bash script to prune stale branches that older than 3 months

prune-stale-branches.sh

#!/usr/bin/env bash
echo ====================================

echo "Pulling the latest branches"
git pull

echo "\n"
for branch in `git branch -r | grep -v HEAD`; do \
    echo -e `git show -s --format="%cr %an" $branch | head -n 1` \\t$branch; \
  done | \
  grep -e '.. months' -e '[3-9] months' | grep 'origin/' | \
  sed 's/.*origin\///' &&
  echo "\nYou sure you want to delete these?"
  echo "y or n"

  read answer
  if [ "$answer" == "y" ]  || [ "$answer" = "yes" ]
    then
    echo "Deleting STALE remote branches"
    for branch in `git branch -r | grep -v HEAD`; do \
        echo -e `git show --format="%cr %an" $branch | head -n 1` \\t$branch; \
      done | \
    grep -e '.. months' -e '[3-9] months' | grep 'origin/' | \
    sed 's/.*origin\///' | \
    xargs -n 1 echo git push origin --delete | bash
  fi