Git: Find duplicate blobs (files) in this tree

Question

This is sort of a follow-up to this question.

If there are multiple blobs with the same contents, they are only stored once in the git repository because their SHA-1\'s

Answer 1

Just made a one-liner that highlights the duplicates rendered by git ls-tree.
Might be useful

git ls-tree -r HEAD |
    sort -t ' ' -k 3 |
    perl -ne '$1 && / $1\t/ && print "\e[0;31m" ; / ([0-9a-f]{40})\t/; print "$_\e[0m"'