Shell function to remove fully merged git branches

git-purge-branches.sh

function git-purge-branches {
  CURRENT_BRANCH=`git rev-parse --abbrev-ref HEAD`

  if ! [ "$CURRENT_BRANCH" = 'master' ]; then
    echo 'Please stash your work and checkout master'
    return
  fi

  git fetch -p

  BRANCHES=`git branch --merged master | grep --invert-match master`

  if [ $BRANCHES ]; then
    echo 'The following local branches will be removed: '
    echo $BRANCHES
    read "REPLY?Continue (y/n)? "
    if [ "$REPLY" = "y" ]; then
      echo $BRANCHES | xargs git branch -d
    fi
  fi

  BRANCHES=`git branch -r --merged master | grep --invert-match master | grep "origin" | sed -e "s#origin/##"`

  if [ $BRANCHES ]; then
    echo 'The following remote branches will be removed: '
    echo $BRANCHES
    read "REPLY?Continue (y/n)? "
    if [ "$REPLY" = "y" ]; then
      echo $BRANCHES | xargs -I% git push origin :%
    fi
  fi
}