Bash script to toggle touchpad state on X server

toggletouchpad

#!/bin/bash

# set your device name here (can be found through `xinput`)
touchpadDevice='SynPS/2 Synaptics TouchPad'

if [ ! -z "$1" ]; then
   # set the device state via argument (must be 0 or 1)
   devEnabled=$1
else
   # toggle the device state
   id=$(xinput --list --id-only "$touchpadDevice")
   devEnabled=$(xinput --list-props $id | awk '/Device Enabled/{print !$NF}')
fi

# alter the device state and subsequently print the state via wm dbus
if [ -n "$DISPLAY" ] ; then
   export DISPLAY=:1
   export touchpadDevice
   export devEnabled
   /usr/bin/su $USER -c '/usr/bin/xinput --set-prop "$touchpadDevice" "Device Enabled" "$devEnabled"'
   /usr/bin/su $USER /usr/bin/notify-send -t 2000 -i "input-touchpad" "$touchpadDevice" "TouchPad device is $([[ $devEnabled -eq 0 ]] && echo -ne "disabled" || echo -ne "enabled")"
else
   /usr/bin/xinput --set-prop "$touchpadDevice" 'Device Enabled' "$devEnabled"
   /usr/bin/notify-send -t 2000 -i "input-touchpad" "$touchpadDevice" "TouchPad device is $([[ $devEnabled -eq 0 ]] && echo -ne "disabled" || echo -ne "enabled")"
fi
unset devEnabled
unset touchpadDevice
unset id

Check https://bbs.archlinux.org/viewtopic.php?id=92896 if you want to call this script via udev rather than manually invocation upon usb mouse plug-in/out.