This book is written with emphasis on practical programming examples, with inputs of theory and concepts behind the programming. The book is divided into two parts, the first part focusing on Advanced Unix programming and the second part on Compiler design. The book aims at providing a compatible way of attempting the problems through detailed algorithm and its implementation. Sailent Features Unix programming and Compiler design focuses on Advanced Unix programming and gives the details about how to programme in shell environment with good examples followed by the programming examples and exercises. Compiler Design gives brief introduction of the phases followed by the algorithm and program implementation in C. with good explanation in detail about Compiler writing tools like LEX, YACC. At the end of each part, exercise questions are included with viva questions.