git-already-merged

#!/usr/bin/env bash

# From https://railsware.com/blog/git-housekeeping-tutorial-clean-up-outdated-branches-in-local-and-remote-repositories/

for branch in $(git branch -r --merged | grep -v HEAD)
do
    printf '%s\t%s\n' "$(git show --format="%ci %cr %an" "$branch" | head -n 1)" "$branch"
done | sort -r