I wonder what Warren Twoomey privately says about the SCO allegations? The Ctcompare program seems explicitly designed to deal with just such problems that SCO alleged had occurred.

TCP/IP Illustrated volume 2 is also quite nice. It is basically a commentary on the IP stack of 4.4BSD-Lite. Lots of source snippets followed by why they did it that way.

I wonder which files will be tried on the search box. Personally I tried "grep.c".

Too bad the page ends truncated with "Similarities between files are found using the"

I wish it also included GNU coreutils.

First, what silentbicycle said.

Second, the source code of coreutils is readily available[1] (pretty much by definition), but this material is probably not otherwise easy to find. (I may be wrong about that, but I certainly wouldn't have known where to look.)

[1] For example: http://git.savannah.gnu.org/cgit/coreutils.git/tree/src

Right. If that code had been easy to find, _Lion's Commentary on Unix_ wouldn't have been such a big deal.

Why would it? GNU's not Unix, after all.