I couldn't agree with your comment more. I was trying to sort this out too. A title that reflects the laundry list of topics: Background Relevant to Revisitin

I couldn't agree with your comment more. I was trying to sort this out too. A title that reflects the laundry list of topics: Background Relevant to Revisiting Unix: The Tree of Unixes, Different Kernel Approaches, and the Baked But Broken "Everything is a File" Assumption