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Full Discussion: Macos is the UNIX?
Top Forums UNIX for Beginners Questions & Answers Macos is the UNIX? Post 303040186 by Corona688 on Thursday 24th of October 2019 02:59:32 PM
Old 10-24-2019
Quote:
Originally Posted by dodona
its true that MacOS is more "unix-like' than Linux because of UNIX certification. On the other hand totally unrelated Z/OS, BS2000 and other proprietary mainframe OS'ses also have posix certification. That's it and that's all either.
That's all it means.
Quote:
MacOS has nothing to do with the classic UNIX approach of free and open
The culture is not UNIX culture, it's BSD and GNU. The entire "classic UNIX approach of free and open" was anti-UNIX backlash! A little history is needed to understand why.
  • Until "recently", UNIX was a monolithic copyright and licensed software hoarded by AT&T.
  • Richard Stallman disliked the closed binary approach and began GNU to create a portable, compatible, open UNIX alternative.
  • BSD, in modern parlance, was an open, pre-AT&T "fork" of UNIX, in pure sourcecode form. "Binary source distribution" in short.
  • Linux was a madcap project out of nowhere which got so popular that GNU adopted it over their HURD kernel.

The modern meaning of UNIX has changed. It's now a paper standard and series of tests of describing the languages, API's, programs, and shells that must be available for an operating system to call itself UNIX. Certification is not free. The standards need upkeep paid for somehow.

So, open and closed systems can both be UNIX, the same way different brands of appliances use the same wall sockets. And the standard means that one UNIX system can run the same software as a completely different UNIX system, given source code and a little work.

Last edited by Corona688; 10-24-2019 at 04:06 PM..
 

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Epoch(3)						User Contributed Perl Documentation						  Epoch(3)

NAME
Time::Epoch - Convert between Perl epoch and other epochs SYNOPSIS
#!/usr/bin/perl -wl use Time::Epoch; my $perlsec = 966770660; # Sun Aug 20 07:24:21 2000 -0400 on Mac OS my $epochsec = perl2epoch($perlsec, 'macos', '-0400'); my $perlsec2 = epoch2perl($epochsec, 'macos', '-0400'); print $perlsec; print $perlsec2; print $epochsec; # correct time on Unix: print scalar localtime $perlsec; # correct time on Mac OS (-0400): print scalar localtime $epochsec; DESCRIPTION
Exports two functions, "perl2epoch" and "epoch2perl". Currently only goes between Perl (Unix) epoch and Mac OS epoch. This is in preparation for an eventual move of Perl to its own universal epoch, so we can get the system epoch of any platform that differs from Perl's. Epochs o macos Takes additional optional parameter of time zone differential. If time zone differential not supplied, we guess by getting the different between "localtime" and "gmtime" with <Time::Local::timelocal>. BUGS
o Hm. With the above test, "scalar localtime $perlsec" under my Linux box and "scalar localtime $epochsec" under my Mac OS box are off by one second from each other. Maybe a leap second thing? Odd. AUTHOR
Chris Nandor <pudge@pobox.com>, http://pudge.net/ Copyright (c) 2000-2003 Chris Nandor. All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the Artistic License, distributed with Perl. SEE ALSO
perl(1), perlport(1), Time::Local. perl v5.18.2 2003-05-21 Epoch(3)
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