delete branches that are older than x days

delete_old_git_branches.sh

# delete branches that are older than x days
# this will delete branches that havent received any commits that are newer than Aug 10, 2016
# see this answer for a bit more detail: http://stackoverflow.com/questions/10325599/delete-all-branches-that-are-more-than-x-days-weeks-old/39277210#39277210

for k in $(git branch -r | sed /\*/d); do 
  if [ -z "$(git log -1 --since='Aug 10, 2016' -s $k)" ]; then
    branchnew=$(echo $k | sed -e "s/origin\///")
    echo deleting branch: $branchnew
    git push origin --delete $branchnew
  fi
done