open ssh or unix terminal on ipad

I want to turn my ipad into a laptop. I intend to get a bluetooth keyboard case or just use my bluetooth keyboard that I use on my mac pro. But I am taking a unix course in college. I want to use my ipad for this class. How do I access the command line / os ?? Is there a terminal.app that I can install on the ipad? This has got to exist someplace, I just have not been able to find it. I know there is a company that will enable me to turn the ipad into a xwindow display but that is a bit overblown for what I am going to be doing. Maybe I have to buy a mac book air and just suck up the price. But I really think this is possible on the ipad. Thanks for your help.