Bash script that will find copyright updates in upgrades and add them to be a single commit

copyright.sh

#!/bin/bash
CHANGED="`git diff --name-only`"
for f in $CHANGED; do
        echo -n "$f... "
        DIFF="`git diff -U0 $f | grep -E '^[+-]' | grep -v -E '^(---|\+\+\+) [ab]/' | grep -v -e '* @copyright Copyright (c)' -e '* @copyright   Copyright (c)'`"
        if [ "$DIFF" == "" ]; then
                git add "$f"
                echo "copyright."
        else
                echo "other."
        fi
done