How can I delete all Git branches which have been merged?

Question

I have many Git branches. How do I delete branches which have already been merged? Is there an easy way to delete them all instead of deleting them one by one?

Answer 1

Based on some of these answers I made my own Bash script to do it too!

It uses git branch --merged and git branch -d to delete the branches that have been merged and prompts you for each of the branches before deleting.

merged_branches(){
  local current_branch=$(git rev-parse --abbrev-ref HEAD)
  for branch in $(git branch --merged | cut -c3-)
    do
      echo "Branch $branch is already merged into $current_branch."
      echo "Would you like to delete it? [Y]es/[N]o "
      read REPLY
      if [[ $REPLY =~ ^[Yy] ]]; then
        git branch -d $branch
      fi
  done
}