Andrew's git / gitweb.git / git-prune-script
?
git-prune-scripton commit Make "fsck" also show what the name of the tag object is, not just (56ce69f)
   1#!/bin/sh
   2fsck-cache --unreachable $(cat .git/HEAD ) | grep unreachable | cut -d' ' -f3 | sed 's:^\(..\):.git/objects/\1/:' | xargs rm