Script How-To Fix Display Manager By Chroot On Broken System

#!/bin/bash
# This script is intended to fix or change your display manager
# It just chroots to your $device system and prints to you current
# default display manager so you could change everything up.
# Written on 18 january 2013 by Security XIII [at gmail dot com]
# when I had a problem of not loading the DM (xdm broke my system somehow)

# You can change a bit this if you want to
# If you have separate /boot partition you MAYBE have to include it

device="/dev/sda1"
cmd="sudo mount"
cmd2="$cmd --bind"
fsname="/mnt"
dev="/dev"
proc="/proc"
sys="/sys"

# Stop changing here, please.

$cmd $device $fsname
$cmd2 $dev $fsname$dev
$cmd2 $proc $fsname$proc
$cmd2 $sys $fsname$sys

sudo chroot $fsname

dm=$(cat /etc/X11/default-display-manager)
echo "Your current display manager is: $dm"
echo "To change it, run nano /etc/X11/default-display-manager and edit manually"
echo "To save in nano, press Ctrl+O and enter"
echo "Recommended: /usr/sbin/gdm or /usr/sbin/lightdm"