From the foreword:

Most people today don’t know what the command line is, much less why they would want to bother with it. As computing pioneer Alan Kay said in a 2017 interview, “Because people don’t understand what computing is about, they think they have it in the iPhone, and that illusion is as bad as the illusion that ‘Guitar Hero’ is the same as a real guitar.”

Off to a good start…

Inspired by traditional UNIX philosophy, driven by an interest in encouraging a more delightful and accessible CLI environment, and guided by our experiences as programmers, we decided it was time to revisit the best practices and design principles for building command-line programs.