Delete merged and stale git branches

git-branch-cleanup.sh

#!/bin/bash

if [ ! -d "$1" ]; then                                                                                                  
    echo "Usage: "$0" path/to/git/checkout"                                                                             
    exit 1                                                                                                              
fi   

cd $1

LOG="tee -a /tmp/branch-cleanup.log"

git checkout master
git fetch
git remote prune origin

branchlist=`git branch -r --merged master | sed 's/ *origin\///' | grep -v 'master$'`

for branch in $branchlist
do
    commitHappendInTheLast4Weeks=`git log -n1 --since="4 weeks ago" "origin/"$branch`
    if [ "$commitHappendInTheLast4Weeks" == "" ]
    then
        echo "To be deleted: "$branch | $LOG
        echo `git log -n1 "origin/"$branch` | $LOG
        # Comment out the following if you don't trust random scripts on the net and just want to see what could be deleted :)
        git push origin ":"$branch | $LOG
    fi
done