REDHCP

#!/bin/bash
if [ "$#" -ne 1 ]; then
    echo "Please Enter the Interface"
    exit 0
fi
EXISTS=`grep "$1" /proc/net/dev`
if  [ -n "$EXISTS" ] ; then
    #read -p "This will delete ALL DHCP leases from all interfaces."
    rm /var/lib/dhcp/dhclient.*
    /sbin/dhclient -r $1
    dhclient $1
    IP="$(ifconfig $1 | grep 'inet addr' | awk -F: '{print $2}' | awk '{print $1}')"
    echo "Your new IP is $IP"
else
    echo "Network Adapter '$1' not found in /proc/net/dev"
fi