vol

#!/bin/bash
volume=$(amixer sget Master | grep -o -m 1 '[[:digit:]]*%' | tr -d '%')

if [ -n "$2" ]
then
        percent_change=$2
else
        percent_change=5
fi

case "$1" in
        up)
                volume=$((volume + percent_change))
                if [ $volume -gt 100 ]
                then
                        volume=100
                fi
                amixer sset Master $volume% unmute
                ;;
        down)
                volume=$((volume - percent_change))
                if [ $volume -lt 0 ]
                then
                        volume=0
                fi
                amixer sset Master $volume% unmute
                ;;
        set)
                volume=$2
                amixer sset Master $volume% unmute
                ;;
        toggle)
                amixer sset Master toggle
                ;;
        mute)
                amixer sset Master mute
                ;;
        unmute)
                amixer sset Master unmute
                ;;
esac

echo $volume

if [ -n "$(amixer sget Master | grep -o -m 1 'off')" ]
then
        notify-send " " -i "/usr/share/icons/Numix/24x24/status/audio-volume-muted-panel.svg" -h int:value:$volume -h string:x-canonical-private-synchronous:volume
elif [ "$volume" -eq "0" ]
then
        notify-send " " -i "/usr/share/icons/Numix/24x24/status/audio-volume-low-zero-panel.svg" -h int:value:$volume -h string:x-canonical-private-synchronous:volume
elif [ "$volume" -le "33" ]
then
        notify-send " " -i "/usr/share/icons/Numix/24x24/status/audio-volume-low-panel.svg" -h int:value:$volume -h string:x-canonical-private-synchronous:volume
elif [ "$volume" -lt "66" ]
then
        notify-send " " -i "/usr/share/icons/Numix/24x24/status/audio-volume-medium-panel.svg" -h int:value:$volume -h string:x-canonical-private-synchronous:volume
else
        notify-send " " -i "/usr/share/icons/Numix/24x24/status/audio-volume-high-panel.svg" -h int:value:$volume -h string:x-canonical-private-synchronous:volume