I have the exact opposite opinion (about the OpenBSD book). I used basic ls, dd, tar, ps, cat, etc. Did not know (still do not) Unix systems beyond configuring

I have the exact opposite opinion (about the OpenBSD book). I used basic ls, dd, tar, ps, cat, etc. Did not know (still do not) Unix systems beyond configuring a basic "how to" driven webservers, DNS servers, etc. Michael Lucas can delve into depths without making it sound too technical IMO. Sure, you can skip chapters too (ktrace in my case) and continue with the next one if it gets heavy. His books can be read by newbies and seasoned pros alike.