#!/usr/bin/bash
set -euo pipefail

if [[ $# != 1 ]] || [[ ! $1 =~ ^o(ff|n)$ ]]; then
        >&2 echo "Usage: $(basename "$0") <on|off>"
        exit 1
fi

readarray -t outputs < <(xrandr | grep -Po '^[^ ]+(?= (?:dis)?connected )')

for o in "${outputs[@]}"; do
        xrandr --output "$o" --set "TearFree" "$1"
done