In this chapter, we explored some of the essential concepts related to managing users and groups in Linux. We learned about file and directory permissions and the different access levels of a multiuser environment. For each main topic, we focused on basic administrative tasks, providing various practical examples and using typical command-line tools for everyday user access and permission management operations.
Managing users and groups, and the related filesystem permissions that come into play, is an indispensable skill of a Linux administrator. The knowledge gained in this chapter will, we hope, put you on track to becoming a proficient superuser.
In the following chapter, we continue our journey of mastering Linux internals by exploring processes, daemons, and inter-process communication mechanisms. An important aspect to keep in mind is that processes and daemons are also owned by users or groups. The skills learned in this chapter will help us navigate the related...