Shell script scripts to get hostnames from IPs and VIPs listed in ifconfig

gistfile1.txt

#!/bin/sh
# Shell script scripts to get hostnames from IPs and VIPs listed in ifconfig
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# Based off of http://bash.cyberciti.biz/misc-shell/read-local-ip-address/

PATH=$PATH:/sbin

# Get OS name
OS=`uname`
IPS="" # store IPS

case $OS in
  Linux)
		IPS=`ifconfig  | grep 'inet addr:'    | grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'`
	;;
	FreeBSD|OpenBSD|Darwin)
		IPS=`ifconfig  | grep -E 'inet.[0-9]' | grep -v '127.0.0.1' | awk '{ print $2}'`
	;;
	SunOS)
		IPS=`ifconfig -a | grep inet | grep -v '127.0.0.1' | awk '{ print $2} '`
	;;
	*)
		IPS="Unknown"
	;;
esac

for IP in $IPS
do
    # Need HNAME so that one entry prints per line, even for null records.
    HNAME=`dig +short -x $IP`
	echo "$IP = $HNAME"
done