+1 for the McKusick books. The red one in particular was such a cherished publication in my collection, for years I wished I had an equivalent for the Linux ke

+1 for the McKusick books. The red one in particular was such a cherished publication in my collection, for years I wished I had an equivalent for the Linux kernel, it never quite arrived. There's also a series of videos from classes McKusick taught. Back in the 90s/early 2000s I attended some viewings of these at the apartment of some High Voltage Software employees back in IL. They'd convinced their employer to foot the bill on buying the full VHS set (I think it was $1k/tape), and hosted a bunch of viewing "parties". Whenever McKusick had to explain some virtual memory details, he'd have vi as the running process and some user started up emacs, then he'd walk through all the minutia of paging and swap. It was quite amusing at the time, he was a master at throwing fuel on the emacs vs. vi religious wars. I was never a huge freebsd fan, but these books were very well done and McKusick a tremendous asset to that community.