spring clean your git repos!

gistfile1.sh

# remove any bad refs
git remote prune origin

# pipe into bash and auto-delete any branches that have been merged into master!
git log master --pretty=format:'%d' | grep '^ (origin' | tr -d ' ()' | sed 's/origin\//git push origin :/'

I missed a backslash in the grep -v, that's why :)