pa_sink_volume (pulseaudio volume controller)

#!/bin/bash

#
# pulseaudio volume controller
# written by Geyslan G. Bem
#

script=$(basename "$0")
sinks=$(pacmd list-sinks | awk '/index: / { gsub(/*/, "", $0); print $2 }')
opt=$1
vol=${2:-5}

usage() {
        echo -e "usage: $script [options]
  where options are:
  vol-up [%]\tincrease volume % (default: 5%)
  vol-down [%]\tdecrease volume in % (default: 5%)
  toggle\ttoggle mute/unmute"
}

for sink in $sinks
do
        case $opt in
        vol-up)
                pactl set-sink-volume $sink +$vol%
                ;;
        vol-down)
                pactl set-sink-volume $sink -$vol%
                ;;
        toggle)
                pactl set-sink-mute $sink toggle
                ;;
        *)
                usage
                exit 0
                ;;
        esac
done

muted=$(pactl list sinks | awk '/Mute: yes/ { print $2; exit }')

case $opt in
vol-up)
        notify-send -i audio-volume-high "Volume increased"
        ;;
vol-down)
        notify-send -i audio-volume-low "Volume decreased"
        ;;
toggle)
        if [ "$muted" == "yes" ]; then
                notify-send -i audio-volume-muted "Sound muted"
        else
                notify-send -i audio-volume-medium-symbolic "Sound unmuted"
        fi
        ;;
esac

exit 0