Atleast that's the way we do it.
I don't want to build it with RAD or WAS Admin Console, just script that i want.
If my understanding is correct, just add an instance of the WAS server to your workspace, and then right click on the server, select Add/Remove Projects and add your project. This way, you don't have to build the EAR/WAR file at all... Building your project is enough. If the build is successful, then RAD automatically builds the EAR/WAR and publishes the file to the server.
My understanding is that you build the EAR/WAR, then open your browser, login to the admin console, then deploy your application.