The book “Unix Operating System” by Andrei Robachevsky is not just a textbook, but a real encyclopedia dedicated to one of the most influential operating systems in the world. Unix, with its powerful architecture and philosophy, has become the basis for many modern systems, including Linux and macOS. In this work, the author, with deep knowledge and experience, shares with readers all the intricacies of working with Unix, starting from the basics and ending with complex concepts. The book is intended for a wide audience: from students and novice programmers to experienced specialists and system administrators who want to deepen their knowledge. If you are interested in programming, system administration or just want to understand how one of the most popular operating systems works, this work will become an indispensable assistant for you. In it you will find not only theoretical aspects, but also practical examples that will help to consolidate the knowledge gained. One of the main topics raised by the author is the Unix philosophy based on the principles of simplicity, modularity and code reuse. Robaczewski explains how these principles affect software development and system administration. It also addresses security, resource management, and networking issues, making the book relevant to today's realities as cyber threats become increasingly sophisticated. Andrei Robachevsky's writing style is distinguished by accessibility and clarity. He is able to explain complex things in simple language, which makes his books especially valuable for beginners. In addition, the author actively uses examples from real practice, which allows the reader to better understand how to apply theoretical knowledge in practice. This quality makes the "Unix Operating System" not only a tutorial, but also a practical guide that you can keep at hand at any time. If you are already familiar with Robachevsky's other works, such as "System Administration of Linux" or "Programming in Python", you will appreciate his approach and style. He always strives to ensure that his readers not only absorb the material, but also can apply it in their professional activities. In the "Unix Operating System", the author offers many exercises and tasks that will help to consolidate what has been learned and develop skills in working with the system. The book also raises important questions about the future of Unix in the context of the rapid development of technology. What will the operating system look like in a few years? What new opportunities will open up for developers and users? Robachevsky not only answers these questions, but also inspires the reader to think about his own path in the world of technology . In conclusion, the “Unix Operating System” by Andrei Robachevsky is a must-read for anyone who wants to understand more deeply the basics of working with one of the most significant operating systems. The book combines theory and practice, accessible language and in-depth knowledge, making it a valuable resource for a wide range of readers. Do not miss the opportunity to immerse yourself in the world of Unix and discover new horizons in programming and system administration!