git_branch_search_stale.sh

function git_branch_search_stale {
  echo "ahead | behind | branch name"
  git for-each-ref --format="%(refname:short) %(upstream:short)" refs/remotes | \
  while read remote
  do
      git rev-list --left-right origin/master...${remote} -- 2>/dev/null >/tmp/git_upstream_status_delta || continue
      BEHIND=$(grep -c '^<' /tmp/git_upstream_status_delta)
      AHEAD=$(grep -c '^>' /tmp/git_upstream_status_delta)
      echo "$AHEAD $BEHIND $remote"
  done | \
  sort -n
}