About Linux to be a core study subject it's not something new , I only want to help as i have a subject this term called Operating systems theory , so i think that i can provide heba with Info about our Course at AAST and spec. about the C programming under Linux, Course overview and outlines , also provide her with Some Course slides and scientific books and Documentation built on the international Operating systems and systems Programming science provided by famous authors and famous Universities ,(Stanford , MIT),some other documents dicussing (tanenbaum operating systems design) and documents discussing also some different open Source OS Kernel technical, some technical idea about different project related to embeded linux, our course is already devided in to 3 parts , (Theory concepts and) , (Technical Concepts and Kernel module programming) and (Linux Operator)