brn.sh

#!/bin/bash

PATH2BRNS="/proc/acpi/video/VGA1/LCDD/brightness"
MAX_BRN_LEVEL=`cat $PATH2BRNS | head -n 1 | awk '{print $NF}'`
MIN_BRN_LEVEL=`cat $PATH2BRNS | head -n 1 | awk '{print $2}'`
CUR_BRN_LEVEL=`cat $PATH2BRNS | tail -n 1 | awk '{print $2}'`
PERCENTAGE=`echo "$CUR_BRN_LEVEL/($MAX_BRN_LEVEL-$MIN_BRN_LEVEL)*100" | bc -l | awk -F"." '{print $1}'`

/usr/local/bin/osd_client $PERCENTAGE