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#!/bin/bash
#
# @author Andreas Fankhauser
#
# This script required root access to some files in "/sys/class/backlight/".
# You may want to make root owner of this file and whitelist the script in the
# sudoers file:
# +----------------------------------------------------------------------------
# | Cmnd_Alias CMD_BRIGHTNESS = /path/to/this/script/my-brightness.sh
# | yourUsername ALL=(ALL) NOPASSWD: CMD_BRIGHTNESS
# +----------------------------------------------------------------------------
cur=$( cat /sys/class/backlight/intel_backlight/brightness )
min=$( cat /sys/class/backlight/intel_backlight/bl_power )
max=$( cat /sys/class/backlight/intel_backlight/max_brightness )
range=$( echo $max-$min | bc )
curPercent=$( echo "($cur-$min)*100/$range" | bc )
if [ $# -eq 0 ] ;then
# No argument given. Print current brightness in percent.
echo "$curPercent"
exit;
elif [ "$1" == "--help" ] ;then
echo "examples:"
echo " - $0 50 # Set brightness to 50%"
echo " - $0 +10 # Increase brightness by 10%"
echo " - $0 -10 # Decrease brightness by 10%"
exit;
fi
if [ "$EUID" -ne 0 ] ;then
# We're not root. Run ourself with root privileges.
sudo $0 $@;
exit;
fi
level=$1
if [[ "$level" =~ ^[+|-] ]] ;then
# Calculate absolute for specified relative value.
level=$( echo "0$level+$curPercent" | bc )
fi
# Fix max and min exceedations.
if [ $level -lt 2 ] ;then
echo "[WARN ] Level '$level' set to 2.";
level=2
elif [ $level -gt 100 ] ;then
echo "[WARN ] Level '$level' cut to 100."
level=100
fi
# Translate percent to target scale
nxt=$( echo $level*$range/100 | bc )
# Write evaluated brightness
# Variant using hardware (usually sudo required)
echo $nxt | sudo tee /sys/class/backlight/intel_backlight/brightness > /dev/null
# Software variant (usually sudo NOT required).
#xrandr \
# --output DVI-I-1 --brightness $level \
# --output HDMI-0 --brightness $level \
# --output DVI-D-0 --brightness $level \
#;
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