git ls-files | xargs -n1 git blame --line-porcelain | sed -n 's/^author //p' | sort -f | uniq -ic | sort -nr

#git ls-files | grep -Ei "\.h$|\.cpp$|\.hh$|\.cc$" | xargs -n1 git blame --line-porcelain | sed -n 's/^author //p' | sort -f | uniq -ic | sort -nr