http://codeinject.org's Edit for the BT5 custom script

#!/bin/bash


if [[ $EUID -ne 0]]; then
  echo "[-] Some tools in this script require you to be root."
  exit 1
fi
if [ $# -ne 1 ]; then
  echo "[-] Please supply iso."
  exit 1
fi
btisoname=$1

clear
echo "##############################################################"
echo "[*] BackTrack 5 Final customisation script"
echo "[*] Setting up the build environment..."

services="inetutils-inetd tinyproxy iodined knockd openvpn atftpd ntop nstxd nstxcd apache2 sendmail atd dhcp3-server winbind miredo miredo-server pcscd wicd wacom cups bluetooth binfmt-support mysql"

mkdir -p mnt
mount -o loop $btisoname mnt/
mkdir -p extract-cd
rsync --exclude=/casper/filesystem.squashfs -a mnt/ extract-cd
mkdir -p squashfs
mount -t squashfs -o loop mnt/casper/filesystem.squashfs squashfs
mkdir -p edit
echo "[*] Copying over files, please wait ... "

cp -a squashfs/* edit/

cp /etc/resolv.conf edit/etc/
cp /etc/hosts edit/etc/
cp /etc/fstab edit/etc/
cp /etc/mtab edit/etc/

mount --bind /dev/ edit/dev
mount -t proc /proc edit/proc

echo "##############################################################"
echo "[*] Entering livecd. "
echo "##############################################################"
echo "[*] Now you can modify the LiveCD. At minimum, we recommend :"
echo "[*] apt-get update && apt-get upgrade & apt-get clean"
echo "##############################################################"
echo "[*] If you are running a large update, you might need to stop"
echo "[*] services like crond, udev, cups, etc in the chroot"
echo "[*] before exiting your chroot environment."
echo "##############################################################"
echo "[*] Once you have finished your modifications, type \"exit\""
echo "##############################################################"

chroot edit

echo "[*] Exited the build environemnt, unmounting images."