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#!/bin/bash
# Allows you to adjust display backlight from the command line.
# USAGE: backlight <brightness change>
# The brightness change can be positive (for brighter) or negative (for darker).
# NOTE: requires root privileges.
brightness=`cat /sys/class/backlight/intel_backlight/brightness`
delta="$1"
if [[ ! $delta =~ ^-?[0-9]+$ ]]; then
echo "Not a number!"
exit 1
fi
new_brightness=$((brightness + delta))
if [[ new_brightness -gt 7500 ]]; then
new_brightness=7500
elif [[ new_brightness -lt 0 ]]; then
new_brightness=0
fi
# echo $new_brightness
tee /sys/class/backlight/intel_backlight/brightness <<< "$new_brightness"
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