April fools joke or not, this book is seriously useful. Even though I will likely never use ed(1) directly on purpose, I'm now comfortable enough to get by. More importantly, I discovered a lot of the underlying logic behind vim's Ex mode, g/re/p, and sed that weren't as intuitive before. Michael's tone and humor kept what could have been a very boring topic wildly engaging. I was sharing snippets with people all throughout my read and even went back to give the regex section a second pass.

If this book has come across your path, do yourself a favor and pick it up. It's worth every penny.