Delete all remote branches
git fetch -p && for branch in $(git for-each-ref --format '%(refname) %(upstream:track)' refs/heads | awk '$2 == "[gone]" {sub("refs/heads/", "", $1); print $1}'); do git branch -D $branch; done
Log all local branches
git branch | grep -v "master" >/tmp/merged-branches | nano /tmp/merged-branches