title: Subscribe to S3 bucket notifications SNS Topic directly on EC2 instance
body: <p>I'd like to subscribe to a S3 bucket notifications SNS Topic directly on an EC2 instance where I have a script running that's listening for a S3 bucket update event.</p>
  
  <p>I assume I need to do:</p>
  
  <pre><code>aws sns subscribe --topic-arn [ARN of S3 bucket update topic] --protocol [email, email-json, http, https, or sqs]
  </code></pre>
  
  <p>What protocol would make sense in this context?</p>