play framework 2.0 How can I specify a different f

问题:

I want to run play from a utility script which is not under the application's folder.

In play 1 you could write something like

play run  /my/path 

however, I cannot find this option in play 2.0

keep getting :

This is not a play application!

I am also unable to find a manual for this command anywhere.

please help.