iPhone - Execute iphone app from documents folder

I'm writing an app which must download other apps and EXECUTE them from the documents folder. One of the approaches I was thinking about is to use a bash script like the one in installous which unzips the app and copies whatever whenever it's needed.That way I can install it,but not execute开发者_开发百科 it.

So I was wondering if there is a way to just unzip it and run it from within the documents folder.I am using a jailbroken device so the roo access is not a problem.

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I don't have a jailbroken phone, but maybe open -a ... would work?