read ip from output file of hponcfg

blah

<!-- HPONCFG VERSION = "4.3.0" -->
<!-- Generated 3/6/2014 15:4:58 -->
<RIBCL VERSION="2.1">
 <LOGIN USER_LOGIN="Administrator" PASSWORD="password">
  <DIR_INFO MODE="write">
  <MOD_DIR_CONFIG>
    <DIR_AUTHENTICATION_ENABLED VALUE = "N"/>
    <DIR_LOCAL_USER_ACCT VALUE = "Y"/>
    <DIR_SERVER_ADDRESS VALUE = ""/>
    <DIR_SERVER_PORT VALUE = "636"/>
    <DIR_OBJECT_DN VALUE = ""/>
    <DIR_OBJECT_PASSWORD VALUE = ""/>
    <DIR_USER_CONTEXT_1 VALUE = ""/>
    <DIR_USER_CONTEXT_2 VALUE = ""/>
    <DIR_USER_CONTEXT_3 VALUE = ""/>
  </MOD_DIR_CONFIG>
  </DIR_INFO>
  <RIB_INFO MODE="write">
  <MOD_NETWORK_SETTINGS>
    <SPEED_AUTOSELECT VALUE = "Y"/>
    <NIC_SPEED VALUE = "10"/>
    <FULL_DUPLEX VALUE = "N"/>
    <IP_ADDRESS VALUE = "6.3.251.27"/>
    <SUBNET_MASK VALUE = "255.255.248.0"/>
    <GATEWAY_IP_ADDRESS VALUE = "6.3.248.1"/>
    <DNS_NAME VALUE = "tc-lss05-i"/>
    <PRIM_DNS_SERVER value = "6.3.6.52"/>
    <DHCP_ENABLE VALUE = "Y"/>
    <DOMAIN_NAME VALUE = "inf.ise.com"/>
    <DHCP_GATEWAY VALUE = "Y"/>
    <DHCP_DNS_SERVER VALUE = "Y"/>
    <DHCP_STATIC_ROUTE VALUE = "Y"/>
    <DHCP_WINS_SERVER VALUE = "Y"/>
    <REG_WINS_SERVER VALUE = "Y"/>
    <PRIM_WINS_SERVER value = "0.0.0.0"/>
    <STATIC_ROUTE_1 DEST = "0.0.0.0" GATEWAY = "0.0.0.0"/>
    <STATIC_ROUTE_2 DEST = "0.0.0.0" GATEWAY = "0.0.0.0"/>
    <STATIC_ROUTE_3 DEST = "0.0.0.0" GATEWAY = "0.0.0.0"/>
  </MOD_NETWORK_SETTINGS>
  </RIB_INFO>
  <USER_INFO MODE="write">
  <ADD_USER
    USER_NAME = "Admin"
    USER_LOGIN = "Admin"
    PASSWORD = "%user_password%">
    <ADMIN_PRIV value = "Y"/>
    <REMOTE_CONS_PRIV value = "Y"/>
    <RESET_SERVER_PRIV value = "Y"/>
    <VIRTUAL_MEDIA_PRIV value = "Y"/>
    <CONFIG_ILO_PRIV value = "Y"/>
  </ADD_USER>
  </USER_INFO>
 </LOGIN>
</RIBCL>

hponcfg.blah.rb

#!/usr/bin/env ruby
require 'rexml/document'
require 'tempfile'

file = Tempfile.new('blah')

%x!hponcfg -w #{file.path}!

doc = REXML::Document.new file
ip = REXML::XPath.first(doc, '//IP_ADDRESS').attributes['VALUE']

File.unlink file