- max=$(cat /sys/class/backlight/"$SCREEN_DEVICE"/max_brightness)
- cur=$(cat /sys/class/backlight/"$SCREEN_DEVICE"/brightness)
- awk -v max=$max -v cur=$cur 'BEGIN {printf("%d%%", cur/max*100)}'
+ echo -n $((
+ $(cat $SCREEN_BRIGHTNESS_DEVICE_PATH/brightness)
+ / $(cat $SCREEN_BRIGHTNESS_DEVICE_PATH/max_brightness)
+ * 100
+ ))