Find and remove old Git branches

gistfile1.txt

# Update local repo
git fetch origin --prune

# Merged branches at least 2 months old
for branch in `git branch -r --merged | grep -v HEAD`; do echo -e `git show --format="%ci %cr %an" $branch | head -n 1` \\t$branch; done | grep "months" | awk '{print $(NF)}' | sed -e "s/^origin\///" | xargs git push origin --delete --dry-run

# All branches at least a year old
for branch in `git branch -r | grep -v HEAD`; do echo -e `git show --format="%ci %cr %an" $branch | head -n 1` \\t$branch; done | grep "1 year" | awk '{print $(NF)}' | sed -e "s/^origin\///" | xargs git push origin --delete --dry-run