count code lines by git log

echo -e "n-------------------git log start-------------------n"
names=(demo demo2)
added=0
removed=0
totaled=0
for name in ${names[*]};
do
echo -en "$name";
    eval $(git log --author="$name" --pretty=tformat: --since==2019-12-8 --until=2019-12-14 --numstat | awk '{ add += $1; subs += $2; loc += $1 - $2 } END { printf("add=%s, remove=%s, total=%s", add, subs, loc)}' -);
    echo ": added lines: $add removed lines: $remove total lines: $total"
    let added+=${add::-1}
    let removed+=${remove::-1}
    let totaled+=$total
done
echo -e "nAll:  added lines: $added, removed lines: $removed, total lines: $totaled"
echo -e "n------------------------end------------------------"

git log --author="username" --pretty=tformat: --numstat | awk '{ add += $1; subs += $2; loc += $1 - $2 } END { printf "added lines: %s, removed lines: %s, total lines: %sn", add, subs, loc }' -

git log --format='%aN' | sort -u | while read name; do echo -en "$namet"; git log --author="$name" --pretty=tformat: --numstat | awk '{ add += $1; subs += $2; loc += $1 - $2 } END { printf "added lines: %s, removed lines: %s, total lines: %sn", add, subs, loc }' -; done

git log --pretty='%aN' | sort | uniq -c | sort -k1 -n -r | head -n 5

git log --pretty='%aN' | sort -u | wc -l

git log --stat|perl -ne 'END { print $c } $c += $1 if /(d+) insertions/'