Control volume of active PulseAudio audio sink

audio-volume.sh

#!/bin/bash

function get_active_sink ()
{
    input=$(pactl list short sinks | awk '$7=="RUNNING" {print $2}')
    echo -n "$input"
}

function mute_toggle ()
{
    pactl set-sink-mute "$1" toggle
}

function volume_incf ()
{
    pactl set-sink-volume "$1" +2%
}

function volume_decf ()
{
    pactl set-sink-volume "$1" -2%
}

sink=$(get_active_sink)
case "$1" in
    toggle)
	mute_toggle "$sink"
	;;
    incf)
	volume_incf "$sink"
	;;
    decf)
	volume_decf "$sink"
	;;
esac