Script containing two functions to automatically grab IP dynamically

#!/bin/bash
#
# retreiveip.txt - Script containing two functions to automatically grab IP dynamically
#
# Copyright (C) 2001  Oskar Andreasson <bluefluxATkoffeinDOTnet>
#
# Originally written and provided by Jelle Kalf <jkalfATunoDOTnl>. All
# greetings, thanks and feedback should be sent to him for this script.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program or from the site that you downloaded it
# from; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA  02111-1307   USA
#

RetrieveIP() {
  nic="$1"
  TEMP=""

  if ! /sbin/ifconfig | grep $nic > /dev/null; then
    echo -e "\n\n interface $nic does not exist...  Aborting!"
    exit 1;
  fi

  TEMP=`ifconfig $nic | awk '/inet addr/ { gsub(".*:", "", $2) ; print
$2 }'`

  if [ "$TEMP" = '' ]; then
    echo "Aborting: Unable to determine the IP of $nic ... DHCP problem?"
    exit 1
  fi
}

RetrieveBC() {
  nic="$1"
  BROADCAST=`ifconfig $nic | awk '/inet addr/ { gsub(".*:", "", $3) ; print $3 }'`
}