#!/bin/bash
#Copyright 2002 William Stearns <wstearns@pobox.com>
#Released under the GPL.

CommandLine='no'

while [ -n "$1" ]; do
	host -t PTR "$1" 2>/dev/null | grep 'domain name pointer' | sed -e 's/.*domain name pointer //'
	CommandLine='yes'
	shift
done


if [ "$CommandLine" = 'no' ]; then
	while read IPS ; do
		set $IPS
		while [ -n "$1" ]; do
			host -t PTR "$1" 2>/dev/null | grep 'domain name pointer' | sed -e 's/.*domain name pointer //'
			shift
		done
	done
fi