Case study for the Boeing 777

Unix essays

Unix essays Unix was originally developed at Bell Laboratories as a private research project by small groups of people starting 1969. The goal of this group was design an operating system that was written in a high level language rather than assembly language, allow re-use of code and be simple and elegant. Operating systems in that time were large and written in assembly language. UNIX had a small amoutnof code written in assembly language (called the kernel). The remaining code was written in a lanuage called C. As the group continued to develop UNIX , small changes were needed in the kernel and the language to allow the operating system to be completed. Through this work they worked through the kernel and software until a complete operating system was written on top of the kernel in the language C. UNIX is mysterious when you first approach it, I know I was stumped when I signed on that screen and looked at it like a lost puppy. I thought for a moment I was reading a foreign language. It tends to be a little intimidating at first glance. With a little coaxing from the voice in my head I start to click and find it is not all that foreign after all. It is rather complicated at first issuing commands like who > users_on. Nothing appears on the screen and so you think you have done something wrong. You learn the hard way that silence usually equals success. ( 3rd addition UNIX pg 32) ...