This assumes you have downloaded and setup the rabbitmqadmin command line tool.

The rabbitmqadmin command with the list queues option can be used to list a virtual hosts queues, including the number of messages in the queue. Or, the rabbitmqctl list_queues command can be used. Or, the curl command can be used.

rabbitmqadmin list queues

Which should produce something like this.

+-------------------------------------------------------------+----------+
|                            name                             | messages |
+-------------------------------------------------------------+----------+
| queue001                                                    | 0        |
| queue002                                                    | 378      |
+-------------------------------------------------------------+----------+

You can specify the items you wish to include in the output, like this.

rabbitmqadmin list queues messages name vhost

Which should produce something like this.

+----------+-------------------------------------------------------------+-------+
| messages |                            name                             | vhost |
+----------+-------------------------------------------------------------+-------+
| 0        | queue001                                                    | /     |
| 378      | queue002                                                    | /     |
+----------+-------------------------------------------------------------+-------+