What is the difference between Unix operating systems and Unix like operating systems?Both are same or not?
The present owner of the trademark UNIX is The Open Group, an industry standards consortium. Only systems fully compliant with and certified to the Single UNIX Specification qualify as "UNIX" (others are called "Unix system-like" or "Unix-like").
By decree of The Open Group, the term "UNIX" refers more to a class of operating systems than to a specific implementation of an operating system; those operating systems which meet The Open Group's Single UNIX Specification should be able to bear the UNIX 98 or UNIX 03 trademarks today, after the operating system's vendor pays a substantial certification fee and annual trademark royalties[27] to The Open Group. Systems licensed to use the UNIX trademark include AIX, HP-UX, IRIX, Solaris, Tru64 (formerly "Digital UNIX"), A/UX, Mac OS X,[28][29] and a part of z/OS.
...after the operating system's vendor pays a substantial certification fee and annual trademark royalties[27] to The Open Group. Systems ...
ramakrishna said:What is the difference between Unix operating systems and Unix like operating systems?Both are same or not?
derekschrock said:However, this is a goal to make FreeBSD POSIX IEEE 1003.1.
http://www.freebsd.org/projects/c99/index.html
Had to use it for one job, found it "interesting" at best and a right PITA at worst.gore said:VMS is a swear word in my House. We do NOT allow it.
I am so going to copy that reference... I've been flamed for this more than a Rammstein concert hall Ceiling ...
UNIXgod said:It is ironic that OSX is able to pay the open group for the use of the term UNIX; FreeBSD is the core of OSX. Yet FreeBSD had to remove the word UNIX from it's own documentation after the lawsuit and cannot be called UNIX.
This is not correct, even if lots of people believe it is.UNIXgod said:FreeBSD is the core of OSX.
freethread said:From Apple Kernel Programming Guide. There also was another page with a diagram.
tingo said:This is not correct, even if lots of people believe it is.
zeissoctopus said:Our FreeBSD src committer, David Chisnall, wrote a article to describe the relationship between FreeBSD and Mac OX X in deep.
What is Mac OS X
It's almost as much of a mistake to say that OS X is not FreeBSD as it is to say that it is FreeBSD.
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The best way to think of OS X is as a close relative of FreeBSD. It shares a lot of code and is very similar to develop for.
UNIXgod said:It is ironic that OSX is able to pay the open group for the use of the term UNIX; FreeBSD is the core of OSX. Yet FreeBSD had to remove the word UNIX from it's own documentation after the lawsuit and cannot be called UNIX.
drhowarddrfine said:FreeBSD is NOT the core of OSX.
Linuxgamer94 said:So is Darwin a distro of FreeBSD like PC-BSD, and can Pure Darwin programs run on FreeBSD?
drhowarddrfine said:FreeBSD is NOT the core of OSX.