#!/usr/local/bin/bash

#
# IP lister and reverse resolver
#
# Usage: ip.sh [interface]
#
# Lists ips assigned to [interface] and resolves reverse domains for them
# Lists for all interfaces if none given
#
# Made by: kpn
#

i=1; 
for ips in `ifconfig $1 | egrep '[[:space:]][0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}[[:space:]]' | awk '{print$2}'`; do ip[$i]="$ips"; let i=++i; done
let max=$i-1; i=1;
while [ $i -le $max ]; 
do
	host=`host ${ip[i]} | grep pointer | awk '{ printf ("%s",substr($5,1,length($5)-1))}'`
	printf "%-20s: %s\n" ${ip[i]} $host
	let i=i+1;
done