#!/bin/bash

# Output from pactl is long. We're looking for the section under "Sink 1", about
# 10 lines is enough. In those lines we're looking fore "Mute: yes" or "Mute: 
# no". We're counting how many times we find "Mute: yes" to see if volume is 
# already muted.
# Note that sink 1 is hard coded, but you could rewrite this to accept any sink
# or even affect all sinks.

ISMUTED=`pactl list | grep "Sink #1" -A 10 | grep "Mute:" | grep "yes" -c`
if (( $ISMUTED ))
then
	pactl set-sink-mute 1 0
else
	pactl set-sink-mute 1 1
fi