I think this has to do with the BSD’s origins as extensions to AT&T Unix. AT&T Unix shipped with excellent documentation beyond man pages. In fact, some of th

I think this has to do with the BSD’s origins as extensions to AT&T Unix. AT&T Unix shipped with excellent documentation beyond man pages. In fact, some of this documentation was included with FreeBSD, alongside documentation written by key Berkeley people such as Marshall Kirk McKusick. (I don’t know if FreeBSD still ships with this original Unix documentation due to its age. I remember reading a lot of this nearly 20 years ago as a high school student during the days of FreeBSD 5): https://docs-archive.freebsd.org/44doc/ https://docs-archive.freebsd.org/44doc/