hdmi_bg

#!/bin/bash
# Initialize variables, read for dotfile if exists
gvalue=0
bvalue=0
cb=$(xrandr --verbose |grep Brightness |cut -f2 -d:|tr -d [:space:])
cb=$(echo ${cb}*100 |bc)
cg=$(xrandr --verbose |grep Gamma |cut -f2 -d:|tr -d [:space:])
cg=$(echo ${cg}*100 |bc)
echo "Current Brightness: $cb"
echo "Current Gamma $cg:$cg:$cg"
while [ "$1" != "" ]; do
    case $1 in
        -g | --gamma )          shift
                                gvalue="$1"
                                ;;
	-b | --bright)		shift
				bvalue="$1"
				;;
	 -r| --reset )          notify-send "Reseting Brightness and Gamma"
				curBrightness=100
				curGamma=100
				shift
				;;
    esac
    shift
done

# Choosing output for adjustment
output="HDMI-0"
# Setting brightness and gamma
brightness=$(echo $cb+$bvalue|bc)
gamma=$(echo $cg+$gvalue|bc)
b=$(bc <<< "scale=2; $brightness/100")  # Make 0.0-1.0
g=$(bc <<< "scale=2; $gamma/100")
echo "New Brightness: $brightness"
echo "New Gamma: $gamma"
xrandr --output "$output" --brightness "$b" --gamma "$g:$g:$g"
notify-send "Brightness: $brightness | Gamma: $gamma"