Now that you have reached the end of this chapter, you know when and why you should use the command-line tool in macOS. You also understand the structure of a command line-string, when the sudo command should be used, and what the command-line interface in macOS looks like. You can also run several commands to perform a variety of advanced actions, such as for creating directories, changing permissions and ownership, uncovering hidden files and folders, and more. You also learned how to customize your Terminal app by using profiles, marks, and bookmarks. You also know that you can choose different shells that will let you access different "built-in" commands. Finally, you know how to verify the state of your startup disk through the use of the fsck command.
This is also the last chapter of this book. At this stage, you are fully prepared to install and configure macOS, manage users, manage user security and privacy, and manage files, apps, documents, network services...