#!/bin/bash

SINK=$(pactl list short | grep RUNNING | sed -e 's,^\([0-9][0-9]*\)[^0-9].*,\1,')

pactl -- set-sink-volume ${SINK} -5%

VOL=$(pactl get-sink-volume @DEFAULT_SINK@ | grep -oP '\d+?(?=%)' | head -n 1)

notify-send -t 1000 "Volume: ${VOL}%"