Script to get volume notification with dunst http://imgur.com/a/qWgAw

volume.sh

#!/bin/bash
#
# Adjusts the volume and displays the change as a notification.
# 
# Usage:
#
# ```sh
# $ ./volume.sh up
# $ ./volume.sh down
# $ ./volume.sh mute
# ```
#
# Dependencies:
#
# - dunstify
# - pulse audio
# - pulsemixer

function get_volume {
    pulsemixer --get-volume | cut -d ' ' -f 1
}

function is_muted {
    pulsemixer --get-mute
}

function send_notification {
    volume=$(get_volume)
    bar=$(seq -s "─" $(($volume / 5)) | sed 's/[0-9]//g')
    dunstify -i audio-volume-muted-blocking -r 2593 -u normal "    $bar"
}

case $1 in
    up)
        pulsemixer --unmute
        pulsemixer --change-volume +5
        send_notification
        ;;
    down)
        pulsemixer --unmute
        pulsemixer --change-volume -5
        send_notification
        ;;
    mute)
        pulsemixer --toggle-mute
        if [[ "$(is_muted)" = "1" ]] ; then
            dunstify -i audio-volume-muted -r 2593 -u normal "Mute"
        else
            send_notification
        fi
        ;;
esac