gcloud pubsub topics create myTopic
gcloud pubsub topics list
gcloud pubsub topics delete Test1
gcloud pubsub subscriptions create --topic myTopic mySubscription
gcloud pubsub subscriptions delete Test1
gcloud pubsub topics publish myTopic --message "Hello"
gcloud pubsub subscriptions pull mySubscription --auto-ack
gcloud pubsub subscriptions pull mySubscription --auto-ack --limit=3