This book is based on Red Hat© Enterprise Linux 6 (RHEL 6) and it covers three main objectives: a resource for administrators who intend to take the new Red Hat Certified System Administrator (EX200) and the Red Hat Certified Engineer (EX300) exams and pass them; a quick and valuable on-the-job resource; and an easy-to-understand guide to novice and non-RHEL administrators. This book is divided into RHCSA and RHCE sections based on the exam objectives. It includes 21 chapters in total and is structured to facilitate readers to grasp concepts, understand implementation procedures, and learn commands, tools, configuration files, log files, and service daemons involved. The RHCSA Section (chapters 1 to 13) covers all the topics required to prepare for the RHCSA exam. Information presented includes general Linux concepts, basic commands, archiving, compression, file manipulation, file security, text editors, shell features, awk programming, hardware management, local installation, package administration, virtualization, network installation, automated installation, boot procedures, kernel management, user & gr