Git: How do I list local branches that are tracking remote branches that no longer exist?

Question

How can I list any local branches that appear (as per .git/config) to be tracking remote branches that no longer exist? Remote branches are on GitHub in this ca

Answer 1

LANG=en git branch --format='%(if:equals=gone)%(upstream:track,nobracket)%(then)%(refname:short)%(end)' | grep '.'