#!/bin/bash

IPTABLES="sudo iptables -L -v"
LOG1=/tmp/iptables.log.1
LOG2=/tmp/iptables.log.2

[ ! -f "$LOG1" ] && $IPTABLES>$LOG1

rm -f $LOG2
mv $LOG1 $LOG2
$IPTABLES >$LOG1
diff $LOG1 $LOG2