Chapter 1, Data Science at the Command line and Setting It up, covers how to install and configure the command line on multiple platforms of your choosing.
Chapter 2, Essential Commands, is a hands-on demo on using the basics of the command line and where to find help if needed.
Chapter 3, Shell Workflows, and Data Acquisition and Massaging, really gets into performing some basic data science exercises with a live dataset and customizing your command-line environment as you see fit.
Chapter 4, Reusable Bash and Developing Reusable Code in Bash, builds on the previous chapters and gets more advanced with creating reusable scripts and visualizations.
Chapter 5, Loops, Functions, and String Processing, is an advanced hands-on exercise on iterating over data using loops and exploring with regular expressions.
Chapter 6, SQL, Math, and Wrapping it up, is an advanced hands-on exercise to use what you've learned over the last chapters, and we introduce databases, streaming, and working with APIs.