Evidence-Driven Linux: Practical Administration, Security Assessment, Hardening and Verifiable Assurance Linux security is not simply about applying settings. It is about understanding systems, identifying weaknesses, implementing appropriate controls and producing reliable evidence that those controls work. Written by Ian Gracias, this practical technical guide explores Linux administration, cybersecurity assessment, system hardening and evidence-driven verification. Across 260 pages, the book examines essential Linux security concepts, configuration assessment, access controls, auditing, logging, monitoring, compliance mapping and practical verification techniques. Designed for Linux administrators, cybersecurity practitioners, technical students and professionals developing their Linux security skills, it connects theoretical principles with practical system assessment. The book also explores the development and testing of a Linux Security Suite, illustrating how structured security checks, documented findings and repeatable evidence can support stronger security assurance. Whether you are developing your Linux knowledge, strengthening operational security or learning how to document security assessments, this book provides a structured approach to understanding and verifying Linux security controls.