How to launch a specific iOS simulator version using instruments command line

[atultripathy]

Hi,
Please help me on this query.
How are you changing the launch configuration(iPad ,iPhone Retina,etc) of the simulator in your project before launching the instruments command?
In addition i also want to ask whether you know of a way to change simulator version too?
More details are at http://stackoverflow.com/questions/12836129/launch-a-specific-hardware-version-of-ios-simulator-using-instruments-command-li

-Thanking in anticipation
Atul