git-stat.sh

#!/usr/bin/env bash

# Gives you file-by-file change stats between two archives.
# Assuming your two archives are original.tar.gz and modified.tar.gz in 
# the curent directory.

# I know that there is a tool called diffstat for this very purpose,
# and git probably uses it internally as well. I wanted to demo the 
# git-diff --stat command.

mkdir repo
cd repo
tar -zxvf ../original.tar.gz

# Create a git repo with original contents
git init 
git add *
git commit -m 'Initial version'

# Extract the updated contents and commit
tar -zxvf ../modified.tar.gz
git add *
git commit -m 'Modified version'

# Get stats
git diff --stat HEAD~1 HEAD