Update Slack with my iTunes Track

update_slack.sh

#!/bin/bash

state=`osascript -e 'tell application "iTunes" to player state as string'`

if [ $state == 'playing' ];
then
        artist=`osascript -e 'tell application "iTunes" to artist of current track as string'`
        track=`osascript -e 'tell application "iTunes" to name of current track as string'`
        message="$USER is listening to $track by $artist"

        payload="payload={\"channel\": \"#radio\", \"username\": \"webhookbot\", \"text\": \"$message\", \"icon_emoji\": \":imp:\"}"
        curl -X POST --data-urlencode "$payload" {{ slack hook url }} . # https://api.slack.com/incoming-webhooks
fi