Unix Scripting with screen saver

I have been trying commands from every version of Unix. I cannot find a way to start screen saver from Darwin. I am frustrated. Furthermore, is there a way someone can inform me how to connect to a bluetooth phone using a Mac Address. Similar to "hcitool scan" but for Darwin. So, I am looking for two things from a response from this post. 1) What is the alternative command for "hcitool scan" in Darwin and 2) How do I start my screen saver in Unix?
Thank you all!

Wonderful! thank you very much. I will absolutely look into the Mac OS X Technologies forum. Big help!
I understand freeBSD and Darwin are not entirely equivalent. However, I checked out a book on Unix at the library. That book mentioned a few different versions of Unix including freeBSD. I basically used the book for it's commands and figured out which commands worked in Darwin. That took sometime but it is a long process. Now I am just using the manual pages with the command "man".
To answer your question, the cocoa application is not for me because I want to learn to program. I saw on YouTube I could program a script easily so I started.
I've been learning with computers and electronics since I was a young lad (approximately sixth grade for computers and electronics second grade). I learned quickly how much fun these two disciplines could be. In high school my parents pressured me to go into programming but I refused for little reason. Now I recently bought an Apple, after a exploring it a little I found I could download XCode for free. I tried programming in Objective C but my friend advised, "you should learn to program something more simple." so, I tried basic on my TI-86 calculator then I got bored with that and started with Unix. So, here I am learning to code in Unix because of pragmatism (meaning whatever is useful). I have a friend who once knew how to code who is guiding me in my experience. I am hoping to be a computational mathematics major at UCSC. Just waiting for a reply so I am programming to get some skill before I get to my school. I love this stuff!

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