Git repo summary stats for a particular author

author_stats.sh

git log --shortstat --author "AUTHOR NAME" | grep "files changed" | awk '{files+=$1; inserted+=$4; deleted+=$6} END {print "files changed: ", files, "\nlines inserted: ", inserted, "\nlines deleted: ", deleted}'

Remember to change AUTHOR NAME. Check the git log or your config if you're not sure what to use there.