dbacklight

#!/bin/bash
#
# Script that sets backlight brightness to a percentage
#

BLDIR="/sys/class/backlight/intel_backlight"

# Set usage output
USAGE="[-h |--help] <percentage>"
LONGUSAGE="\t-h, --help\n\t\tPrint this help message
\t<percentage>\n\t\tPercentage of max to set"

# Standard functions
source ${SCRIPTS}/functions.sh

# Script name
ME=$(basename $0)

# Parse arguments
ARGS=`getopt -o h --long help -n "${ME}" -- "$@"`

if [ $? != 0 ] ; then
	usage
fi
eval set -- "$ARGS"

while true ; do
	case "$1" in
		-h|--help) usage; shift ;;
		--) shift ; break ;;
		* ) usage "Invalid argument $1";;
	esac
done

#Remaining arguments are in $1, $2, etc. as normal

PER=$1
if [ -z "${PER}" ]; then
	die "Must give a percentage"
fi

MAX=$(cat "${BLDIR}/max_brightness")

TARGET=$((${MAX} * ${PER} / 100))

echo ${TARGET} | sudo tee "${BLDIR}/brightness" > /dev/null