Script to toggle touchpad

Question

This sequence properly shows whether the TouchpadOff option for synclient is on or not (outputs either a 0 or a 1):

synclient | grep 'TouchpadOff' | tail -n 1 | awk '{print substr(3,ドル 1)}'

Trying to make a keyboard shortcut to toggle the touchpad with a basic script based on that line, I wrote this:

#!/bin/bash
PADOFF=$(synclient | grep 'TouchpadOff' | tail -n 1 | awk '{print substr(3,ドル 1)}')
if [ "$PADOFF" == "0" ]
then
 synclient TouchpadOff=1
else
 synclient TouchpadOff=0
fi.

Answer 1

I don't understand the purpose of substr(3,ドル 1) — isn't that the same as 3ドル?

AWK alone can do the work of grep, tail, and negation. I would write it this way:

synclient TouchpadOff=$(synclient | awk '/TouchpadOff/ { off=int(3ドル) }
 END { print !off }')