intel_brightness

   1 #!/bin/bash
   2
   3 if [ "$(id -u)" != "0" ]; then
   4     exec sudo "$0" "$@"
   5 fi;
   6
   7 MAX=$(cat /sys/class/backlight/intel_backlight/max_brightness)
   8 CURRENT=$(cat /sys/class/backlight/intel_backlight/brightness)
   9 NEW=$CURRENT
  10 ADJ=$(( $MAX  / ${2:-20} ))
  11
  12 if [ "$1" == "max" ]; then
  13     NEW=$MAX
  14 elif [ "$1" == "off" ]; then
  15     NEW=0
  16 elif [ "$1" == "min" ]; then
  17     NEW=1
  18 elif [ "$1" == "dec" ]; then
  19     NEW=$(( $CURRENT - $ADJ  < 1 ? 1 : $CURRENT - $ADJ ))
  20 elif echo "$1" | grep -q '^[[:digit:]][[:digit:]]*\%*$'; then
  21     NEW=$(( $(echo "$1" | sed 's/\%//') * $MAX / 100 ))
  22 else
  23     NEW=$(( $CURRENT + $ADJ  >= $MAX ? $MAX : $CURRENT + $ADJ ))
  24 fi
  25
  26 echo $NEW > /sys/class/backlight/intel_backlight/brightness