In this chapter, we will get to know one of the most powerful features of zsh: filename generation. We will learn new ways of dealing with the system's files and directories and even expand the functionalities of some of the more traditional commands by applying parameter substitution and modifiers. The chapter also serves as an introduction to zmv, a built-in function that provides a number of useful functionalities to deal with both the mundane and the more complex tasks regarding files. We will learn to use zmv for renaming, copying, and linking files based on our newly learned patterns. Feeling excited already?