Install an IPA file from an iOS application

I am trying to install an IPA file from my iOS application written in Xcode (jailbreak with root access). At the moment I'm using installBash.shfrom the Installous folder. This script should do exactly what I want, but it does not work correctly. The application starts just fine, but the icon is missing, and the application’s Document folder is not registered properly (the installation process is simply incorrect). Does anyone know how to properly install an IPA file from an iOS application? I heard about installdor MobileInstallation, but I have no idea how to use them.