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#!/bin/sh
# adjust backlight
brightness=$(cat /sys/class/backlight/intel_backlight/brightness)
max_brightness=$(cat /sys/class/backlight/intel_backlight/max_brightness)
step=$((max_brightness/20))
while getopts ud opt; do
case $opt in
u)
case "$brightness" in
0) echo 1;;
1) echo "$step";;
*) echo "$((brightness+step))";;
esac
;;
d)
case "$brightness" in
1) echo 0;;
"$step") echo 1;;
*) echo "$((brightness-step))";;
esac
;;
\?) exit 1;;
esac
done | sudo tee /sys/class/backlight/intel_backlight/brightness > /dev/null
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