Fascinating tale of the birth and evolution of Unix, which starts from just before my birth and continues to this day. I'm astonished at how many decisions made back then have stood through the present day. I work on Unix-based operating systems (Linux and macOS) nearly daily. The tools Kernighan discusses, I use all the time. I'm glad that the 1127 folks made the decisions they did! I was amused, though, to read about the "make" decision to use significant whitespace, and how early they wanted to change that, but couldn't because by then a dozen people were already using "make." The curse of backwards compatibility!