script - checking Betamax rates with a cronjob

This little script can be extended or modified with your own sip providers. It is useful for me to keep and eye open with one of the providers that I'm currently using.

#!/bin/bash

LAST_RATE=$(cat ./md5_12voip.txt | awk '{print $1}')
lynx --dump http://www.12voip.com/en/calling-rates.html | \
    grep -E 'Sweden|Spain' | md5sum > ./md5_12voip.txt
NOW_RATE=$(cat ./md5_12voip.txt | awk '{print $1}')

if [ $LAST_RATE = $NOW_RATE ]; then
   echo "no change on rates"
else
   export DISPLAY=:0 && zenity --info --text 'Betamax 12voip rates changed \
     for Sweden or Spain, check page: http://www.12voip.com/en/calling-rates.html'
fi