#! /bin/sh
CSfile=CSHosts`date '+%m%d%y_%H%M%S'`
Otherfile=OtherHosts`date '+%m%d%y_%H%M%S'`
IPDerviedfile=IPDerivedHosts`date '+%m%d%y_%H%M%S'`
Pingablefile=PingableHosts`date '+%m%d%y_%H%M%S'`


rm -f  $CSfile
touch  $CSfile
rm -f  $Otherfile
touch  $Otherfile
rm -f  $IPDerviedfile
touch  $IPDerviedfile
rm -f  $Pingablefile
touch  $Pingablefile
HostName=""
HostIPaddr=""

j=1
while test $j -le 255
do
        i=1
	while test $i -le 255
	do
                HostIPaddr=128.82.$j.$i
                echo testing $HostIPaddr
                host $HostIPaddr | grep name > answer

                if test $? -eq 0  # is a valid host name
                then
                      HostName=` cat answer | awk '{print $5}'`
                      timeoutcmd 1 ping $HostIPaddr | grep alive > /dev/null
                      if test $? -eq 0  # is  pingable host
                      then
                                  echo  "$HostIPaddr ($HostName)" >> $Pingablefile
                      fi

                      if echo $HostName | grep "\.cs\.odu\.edu" >/dev/null
                      then # CS dept host
		         echo "$HostIPaddr ($HostName)" >> $CSfile
                      else 
			 if echo $HostName | egrep "\-$i|\-$j|$i\-|$j\-|\.$i|\.$j|$i\.|$j\." >/dev/null
                         then #IP related host name
		             echo "$HostIPaddr ($HostName)" >> $IPDerviedfile
                         else
		             echo "$HostIPaddr ($HostName)" >> $Otherfile
                         fi
                      fi
                fi
		i=`expr $i + 1`
	done
	j=`expr $j + 1`
done