https://en.wikipedia.org/wiki/UNIX_System_V I forgot to roman numeral it as SVR4. Yes, a bit off but then the word grep apparently has many implied OS and source! On Wednesday, October 8, 2025 at 04:55:42 AM EDT, [email protected] <[email protected]> wrote:
"David G. Pickett" via Bug reports for GNU grep <[email protected]> wrote: > Wow, so many UNIX ancestral trails, so is MAC OS really a derivative of > AT&T System 5 V 4? This is way off topic, but... The answer is most likely "no". I suspect that the last Unix Apple licensed would have been System V Release 2. The macOS kernel is based on Mach, developed at CMU in the 1980s by taking BSD Unix and replacing the memory management code and adding new kinds of IPC. ("Accent on a Vax", for those who remember such things.) The macOS user land is from FreeBSD. The man page most likely indicates that the egrep command itself originated in AT&T Unix, but it's a good bet that the current macOS egrep code is from FreeBSD. HTH, Arnold
