After reading this chapter, you should now know that the UNIX and Linux-based operating system treats everything as files that can be further categorized as regular, directory, link, block device, character device, socket, and pipe files. You should also know how to perform basic operations on any of these files. Now, you should have good knowledge of how to view and modify the permissions and ownership of a file. You should also know how to monitor and manage the list of open files in a system using the lsof command.

In the next chapter, you will learn how a process gets created in a system and how to monitor and manage all running processes. We will also see how two or more processes communicate with each other using Inter Process Communication (IPC) mechanism.