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#!/bin/bash
# brightness wrapper
case "$1" in
u*)
for f in /sys/class/backlight/*; do
echo $(($(<$f/brightness)+2*$(<$f/max_brightness)/100)) > $f/brightness;
done
;;
d*)
for f in /sys/class/backlight/*; do
echo $(($(<$f/brightness)-2*$(<$f/max_brightness)/100)) > $f/brightness;
done
;;
*)
echo "choose u or d"
;;
esac
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