#! /bin/sh
filename=cs.$2.Hosts`date '+%m%d%y_%H%M%S'`
rm -f $filename
touch  $filename

if test $# -le 1
then
  echo "Usage: cslookup.sh <ftp|www|...> <odu|unc|virginia|..>"
  exit
fi

name=$1.cs.$2.edu

host $name > answer
if  grep not answer > /dev/null
then
echo "$name does not exist"
exit
fi

host $name | grep has > answer 
if grep has answer >/dev/null
then
	addr=` cat answer | awk '{print $4}'`
	echo $name "IP adress is:" $addr
	oldifs=$IFS
	IFS='.'

	set $addr
	ip1=$1
	ip2=$2
	ip3=$3

	prefix=$ip1.$ip2.$ip3
	IFS=$oldifs
	i=1
	while test $i -le 255
	do
        	addr=`echo $prefix'.'$i`
		host $addr > answer 
                if grep not answer >/dev/null
                then
                   echo "$addr does not exist"
                else
	           name=` cat answer | awk '{print $5}'`
		   echo "$addr ($name)"
		   echo "$addr ($name)" >> $filename
		fi
		i=`expr $i + 1`
	done

fi