closing windows shell after rake execution

I need to execute a rak开发者_如何学JAVAe task in a windows machine and unfortunately to do so I have to open a shell. How can I close it once the task has been completed?

system('start rake db:MyTask')

Thanks,.

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maybe something like

 system('start rubyw -S rake db:MyTask')

are you running this from the "run" box? Why is a window popping up?