#! /bin/bash

FISRT=$1
shift
SECOND=$1
shift
RESULT=$1

sed -n -e 's/.*,,//p' $FISRT > /tmp/diff_a
sed -n -e 's/.*,,//p' $SECOND > /tmp/diff_b

# if the output file wasn't specified, ouput to stdout
if [ -z $RESULT ]; then RESULT="/dev/tty"; fi

# you can use whatever diff you want here
diff --suppress-common-lines --strip-trailing-cr /tmp/diff_a /tmp/diff_b > $RESULT