Disable touchpad on Dell Inspiron 15 5000 (P55F)

touchpad.sh

#!/bin/bash
declare -i ID
ID=`xinput list | grep -v 'Synaptics' | grep -Eio '(touchpad|glidepoint)\s*id\=[0-9]{1,2}' | grep -Eo '[0-9]{1,2}'`
declare -i STATE
STATE=`xinput list-props $ID|grep 'Device Enabled'|awk '{print $4}'`
if [ $STATE -eq 1  ]
then
  xinput disable $ID
  #echo "Touchpad disabled."
  #notify-send 'Touchpad' 'Disabled' -i /usr/share/icons/Adwaita/48x48/devices/input-touchpad.png
else
  xinput enable $ID
  #echo "Touchpad enabled."
  #notify-send 'Touchpad' 'Enabled' -i /usr/share/icons/Adwaita/48x48/devices/input-touchpad.png
fi