#!/bin/sh
diff=$3
rm -f "$diff"
if [ ! -d "$1" -o ! -d "$2" ]
then echo Skipping $diff
exit 0
fi
diff -aru $1 $2 | \
sed /"^Only in"/d | \
sed -e 's/^\(---.*\)\t.*/\1/' | \
sed -e 's/^\(\+\+\+.*\)\t.*/\1/' > $diff
if [ ! -s "$diff" ]
then rm -f "$diff"