Script to clean up local branches that have been merged to the current branch.

clean-branches.sh

#!/bin/bash

# Script to clean up local branches that have been merged to the current branch.
# Normally you'd run this while on main.

set -euo pipefail

current=$(git branch --show-current)

git branch --merged | cut -c 3- | while read -r branch; do
    if [ "$branch" != "$current" ]; then
        git branch -d "$branch"
    fi
done