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#!/bin/sh
brightness=$(cat /sys/class/backlight/intel_backlight/brightness)
max_brightness=$(cat /sys/class/backlight/intel_backlight/max_brightness)
step=$((max_brightness/20))
case "$1" in
'-u')
case "$brightness" in
0) echo 1;;
1) echo "$step";;
"$max_brightness") exit 0;;
*)
if [ "$brightness" -gt "$((max_brightness-step))" ]; then
echo "$max_brightness"
else
echo "$((brightness+step))"
fi
;;
esac
;;
'-d')
case "$brightness" in
0) exit 0;;
1) echo 0;;
"$step") echo 1;;
*)
if [ "$brightness" -le "$step" ]; then
echo 1
else
echo "$((brightness-step))"
fi
;;
esac
;;
*) exit 1;;
esac > /sys/class/backlight/intel_backlight/brightness
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