Prune local git branches tracking deleted upstreams

prune-git.sh

#!/bin/bash
set -Eeuxo pipefail

# Update everything, pruning missing upstream first
# then list branches with upstreams to capture gone
# grep fitlers for the gone branches
# awk just the full branch name
# xargs offers to delete the branch

git fetch --prune --all && git branch -vv | grep ": gone]" | awk '{ print $1 }' | xargs -r -n 1 -p git branch -D