Unix: A History and a Memoir

I first came across Unix in the late 970's in college. It was instantly better for programming than the mainframe Univac computer many of my classes have been on.
Reading this book about it's early days was a delight.
Especially since I also worked for the real AT&T (not Bell Labs, but in the computer systems part of the company). Many of the tools and systems described in the book were and are things I use every day.
If you have used Windows, MacOS, IOS, Android or linux, you have encountered Unix.
If you are a software developer you should read this. If you are not, it's still a good introduction to the history of the computers you use everyday.