Nagios plugin!

This plugin allows a web page address to be taken and then checked for given text. A Linux news page can therefore be checked for any virus or hacking news.
Details of usage are in the script itself.

#!/bin/bash
#
#       AUTHOR - Raman Sailopal
#
#       Script to check web page for news alerts i.e. viruses or hacks
#
if [ "$#" != "4" ]
then
        echo "usage: ./newschk.sh -p \"http://www.linux-magazine.com/Online/News\" -t \"Virus\""
        exit
fi
if [ "$1" != "-p" ] || [ "$3" != "-t" ] && [ "$1" != "-t" ] || [ "$3" != "-t" ]
then
         echo "usage: ./newschk.sh -p \"http://www.linux-magazine.com/Online/News\" -t \"Virus\""
        exit
fi
if [ "$1" == "-p" ]
then
        payge=$2
elif [ "$3" == "-p" ]
then
        payge=$4
fi
if [ "$1" == "-t" ]
then
        txt=$2
elif [ "$3" == "-t" ]
then
        txt=$4
fi
resp=$(curl -s $payge | grep -i $txt)
if [ "$(echo $resp)" == "" ]
then
        echo "No News"
        exit 0
else
        echo "News Alert - Go to $payge"
        exit 2
fi
exit