#!/bin/sh
echo Content-type: text/html
echo
N=$QUERY_STRING
echo ""
case "x$N" in
x) N=1
echo "This is the initial page.
"
;;
x[0-9]*) N=`expr $N + 1`
echo "You have refreshed this page $N times.
"
;;
*) echo "The URL you used is invalid."
exit 0
;;
esac
echo ""
echo "Click here to refresh the page.