amen zwa, esq.#UNIX is not just an OS; it is arguably the ultimate #IDE for #programmers. Arguably the best written introductory book on UNIX programming is "The UNIX Programming Environment", Kernighan (1983). This book covers UNIX V7, but I used it with 4.2BSD.
There is another jewel of a book of a similar kind, a free one to boot, by Prof. Ballesteros (King Juan Carlos University): "Introduction to Operating Systems Abstractions Using Plan 9 from Bell Labs" (2007). Prof. Ballesteros wrote this book to teach his CS students the fundamentals of good OS design.
Although almost no one uses #Plan9 today, it is alive and kicking. It even runs on Raspberry Pi. Anyone interested in OSs and likes the philosophical underpinnings of UNIX should take a look at Plan 9.
The other must-read book is his "Notes on the Plan 9 3ed Kernel Source" (2007). It is a Lions-style commentary.
Prof. Ballesteros has many Plan 9 related publications in PDF format.
https://lsub.org/books-papers/
PS—Those with a historical bent should also read Organick's "The Multics System: An Examination of Its Structure" (1980). Multix is the mother of UNIX, and Plan 9 is the grown-up UNIX.
Alfred M. Szmidt
Weekend Editor
Simon Forman
