Since early 1970, Unix Operating System has gone through many metamorphosis. As of now many variants of Unix systems are available and some of them are commercial and whereas the others are freely available. In the recent years, Linux, a public domain, freely available. Unix variant has attracted the people very much. Till today, Unix is believed to be bread and butter of Computer Science intern's. In this book, first nine chapters deal with "how to get hands on exposure to Unix Operating System". Subsequent chapters explain "Unix internal programming". All the examples given are tested under Linux environment. Salient Features - Examples given in Processes are very illustrative and concept oriented. Simple examples are taken to explain the concepts in thorough manner - Chapter on Signals explains the reliable and unreliable way of handling signals while introducing the basic concepts from scratch - Chapters such as pipes, message queues, shared memory, semaphores and memory mapping are dealt in detail with vivid examples, such that, the users can immediately correlate their theoretical concepts learnt in Operating Systems courses with practical programming examples, explained in this book In Second Edition - Added a new chapter on network programming under unix. It introduces the reader to elements of network programming using TCP/IP relate system calls - Simple and easy examples are included which are tested under Linux