#!/sbin/bash

DH_PID=`ps aux |grep '^.*dhclient eth[0-9].*$'|awk '{print $2}'`
#if [ !$DH_PID="" ]; then
if [ !$DH_PID ]; then
   if [ "$DH_PID" = `cat /var/run/dhclient.pid` ]; then
       echo "killing previously dhclient PID $DH_PID..."
       kill -9 `cat /var/run/dhclient.pid`
       /sbin/ifconfig eth1 down
   fi
fi
echo "Detach the wireless card and press Enter"
read

/etc/init.d/network restart