Easily set brightness of connected monitors via xrandr

set_brightness.sh

#!/bin/bash

# Match 0.x-1
REGEX='^0.+([0-9]+)+$|1'

SCRIPT_NAME=`basename "$0"`
if ! [[ $1 =~ $REGEX ]] ; then
   echo "Usage: ${0##*/} <brightness_value_0.x_to_1>" >&2; exit 1
fi

OUTPUTS=`xrandr | grep connected | grep "mm$" | awk '{print $1}'`
for x in $OUTPUTS; do
	xrandr --output $x --brightness $1
done