Now, it's time to discuss the operation and lifecycle of an operating system. This chapter explores the practical aspects of managing a live GNU/Linux environment. We will begin by examining the startup and shutdown system. Then, you will learn how to identify and manage CPU- and memory-intensive processes, as well as methods for adjusting process scheduling. We study tuning profiles to optimize performance for specific workloads. Next, this chapter will empower you to locate and interpret system log files and journals. We will master starting, stopping, and checking the status of network services, a fundamental skill for any network administrator. The chapter concludes by examining secure methods for transferring files between systems, ensuring your data moves safely across your network.