git-code-lines-by-author-email.sh

git ls-files | \
while read f; do \
    git blame -w -M -C -C --line-porcelain "$f" | \
   grep -I '^author-mail '; \
done | cut -f2 -d'<' | cut -f1 -d'>' | sort -f | uniq -ic | sort -n