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#!/bin/bash
device=$(find /sys/class/backlight/* -maxdepth 1 | head -n 1)
max=$(cat "$device/max_brightness")
current=$(cat "$device/brightness")
step=20
case "$1" in
get)
echo "$current"
;;
dec)
if [[ "$current" -gt 0 ]]; then
echo $(( current - step )) > "$device/brightness"
fi
;;
inc)
if [[ "$current" -lt "$max" ]]; then
echo $(( current + step )) > "$device/brightness"
fi
;;
*)
echo "Unknown argument $1" >&2
exit 1
;;
esac
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