https://en.wikipedia.org/wiki/Single_UNIX_Specification
Contains the whole history of the various competing certification schemes or later revisions of schemes. Note Linux and OS/390 are both formerly certified. And this is due to the cost of getting each version certified, not that incompatibilities to the standard have been introduced into the software. On Wed, Jan 22, 2025 at 11:41 AM Radoslaw Skorupka <00000471ebeac275-dmarc-requ...@listserv.ua.edu> wrote: > > W dniu 22.01.2025 o 17:50, Paul Gilmartin pisze: > > On Wed, 22 Jan 2025 08:53:00 -0600, Jay Maynard wrote: > > > >> And it's a remarkable fact that MVS was the first non-Unix to get POSIX > >> certification... > >> > > Oxymoron? > > > > Or is "POSIX certification" different from "UNIX Branding"? > > > > Otherwise, with that certification MVS lost its distinction as a > > "non-Unix". > > > > Perhaps the word "formerly" belongs there somewhere. > Dialectic. Or matter of definition. 1. If your toy car or fishing rod > behave as Unix - it is unix. It can mechanical computer, whatever. Black > box. 2. Unix is a clone or fork or descendant or child of some Unix. In > that case many popular Unixes were not Unix as defined in p.1. Reason: > non-compliance with the standard. AFAIR there was a time where some > OS/390 was UNIX certified, but HP-UX was not. Or maybe it was Irix, but > I believe it was HP-UX. BTW: Unix systems are very similar one to each > other... unless we look at "ls" command switches. Or first character in > "drwxrwxrwx" (different set of possible values, different meanings). > Etc. etc. ;-) Of course Solaris and HP-UX are unixes, despite of their > standard-compliance status and mutual differences. Linux is not Unix, > because... it is not certified? > > > -- > Radoslaw Skorupka > Lodz, Poland > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
