A Bash script to delete already merged remote and local Git branches

delete_merged_git_branches.sh

#!/bin/bash

# Usage: 
#        chmod +x delete_merged_git_branches.sh
#        ./delete_merged_git_branches.sh /path/to/git/repo
DIR="$1"

if [ -z "$DIR" ]; then
	echo "Error: Git directory path should be provided."
	echo "Usage:"
	echo "       ./delete_merged_git_branches.sh /path/to/git/repo"
else
	cd "$DIR"

	for OUTPUT in $(git branch -a --merged)
	do
		if [[ $OUTPUT =~ ^remotes\/origin\/ ]]; then
			[[ $OUTPUT =~ ^remotes\/origin\/(.+)$ ]]
			
			BRANCH="${BASH_REMATCH[1]}"

			if [ $BRANCH = "HEAD" ] || [ $BRANCH = "master" ]; then
				echo "Skipping $BRANCH branch deletion."
			else
				printf "Deleting $BRANCH branch...\r"
			
				git push origin :$BRANCH
				git branch -d $BRANCH
			fi
		fi
	done
fi