Full end to end testing using java and selenium webdriver

I've recently created a framework that successfully tests the GUI of my project. Now I would like to extend my testing by creating full end to end testing of functional tests. These tests would execute the following core steps.

1. Create Profile using the GUI ( this is done using Java selenium webdriver)
2. Call a unix script
3. After the script has ran verify expected information in the DB

I have already completed the first step I'm wondering should I integrate step 2 and 3 into my already existing framework? Can I do all this with Java? Is there any documentation to help me with step 2 & 3?