#!/bin/ksh
#Output the fully qualified domain name of every host on the local network
#whose ethernet address is not currently in the ARP cache.

cd /tmp

~mm64/public_html/x52.9547/src/localhosts.pl 128.122.253.152 26 |
awk '{print $2}' |
tr '[a-z]' '[A-Z]' |
sort > $$.all

/usr/sbin/arp -a |
awk 'NR >= 5 {print $2}' |
tr '[a-z]' '[A-Z]' |
sort > $$.incache

comm -23 $$.all $$.incache   #hosts in $$.all but not in $$.incache
rm $$.all $$.incache
exit 0