#!/bin/bash

MASTER_STATE=$(amixer sget Master | grep -Po "(?<=\[)(on)|(off)(?=\])" | head -n1)

if [ $MASTER_STATE = "off" ]
then
    echo 0
else
    echo $(amixer sget Master | grep -Po "(?<=\[)[[:digit:]]+(?=(%\]))" | head -n1)
fi