Git command to remove gone branches

.gitconfig

[alias]
  gone = ! "git fetch -p && git for-each-ref --format '%(refname:short) %(upstream:track)' | awk '$2 == \"[gone]\" {print $1}' | xargs -r git branch -D"

git-gone.sh

#!/bin/bash
git config --local include.path ../.gitconfig

Mainly inspired by https://www.erikschierboom.com/2020/02/17/cleaning-up-local-git-branches-deleted-on-a-remote/