If you find yourself in need of a script to toggle your touchpad on/off (because like me, your pc does not have a function key for that purpose), this may help.
#!/bin/sh
# This shell script is PUBLIC DOMAIN. You may do whatever you want with it.
# In the commands below 13 is a variable to be identified with xinput list
# Updated & edited by ManyRoads
TOGGLE=$HOME/.toggle_touchpad
if [ ! -e $TOGGLE ]; then
touch $TOGGLE
xinput disable 13
notify-send -u low -i mouse --icon=/usr/share/icons/HighContrast/256x256/status/touchpad-disabled.png "Trackpad disabled"
else
rm $TOGGLE
xinput enable 13
notify-send -u low -i mouse --icon=/usr/share/icons/HighContrast/256x256/devices/input-touchpad.png "Trackpad enabled"
fi