I'm just asking out of curiosity, is there a way to obtain a 'pure' so to say copy of Unix? So, not OS X or Linux with Unix in the background, but simply Unix..
Unix as a standalone entity doesn't exist as a modern operating system.
As indicated by the comments for unix-derivatives:
Several systems started with Unix source code, but this was written out over time so that no original Unix code remains. The best known examples are OpenSolaris, FreeBSD, NetBSD and OpenBSD.FreeBSD 5.3 2004-08 OpenBSD 4.6 2009-10 NetBSD 5.0.2 2010-02 OpenSolaris build 135 2010-03
There have been many systems which implement the Unix system calls, library APIs and commands, but which did not include any original Unix source code. Here is a small selection.Minix 1.1 1987-01 Xinu 1987-01 Minix 1.5 1989-11 Linux 0.96c 1992-07 Coherent 4.2 1994-12 Minix 2.0 1996-10 Linux 184.108.40.206 2010-04
Modern distributions don't contain any original unix code, or at least - none of the open source variants that are freely available.
If you want to be hard core, you can run a V7 Unix on a PDP-11 emulator. I've done this, and it had better performance than VAX running 4.2BSD I used in college.
This image shows a simplified version of the history of the unix-like operating systems. Depending on what you call the "one true unix system", you may download it as open source or you can buy a license for it. The latter will be expensive if at all possible.
I know, it's a very old post. But if someone wants to try out classic Unix, it is available as a virtual box image through http://www.nordier.com/v7x86/releases/v7x86-0.8a-vm.zip
It is the first public release of V7/x86, a port of UNIX version 7 to x86 based PCs.
For a quick guide, refer to this http://www.nordier.com/articles/v7x86_vbox.html
As soon as Unix got out of the Bell Labs in 74 or so, Unix became a family of OS more than an OS. And since 89, there have been no release on the original branch. The trademark "Unix" has changed multiple time of owner and currently it is defined by a set of interface and you can buy the right to use it if you show that you comply to the current definition.
You may be able to use one of the ATT one on an emulator (I've seen some packaging for some release, but not the latest one).
Commercial Unix (Solaris, AIX, HP-UX) have usually taken the pain to go through the certification process. Solaris was available at no cost from Sun (I think Oracle changed the condition) and has been put in open source. Going that path is probably the cheapest way to get something near of what has been allowed to use the label. But affirming that it is a "pure" unix is under debate. Some BSD derivatives have good arguments for "purity" as well.
What do you mean by UNIX? The last "true" Bell Labs unix was Version 10 from 1989, never released to the public. Most modern UNIXes descend ultimately from Version 7. The history of UNIXes is very messy, a brief version is available here. From there, it gets very messy. You can trace UNIX from there to either (closed-source) System V UNIX or BSD. If you want to go down the BSD path, FreeBSD is a good option. For a System V-like system, your only real free option would be OpenSolaris. But nowadays, Linux is as pure a unix-like system as any, with its own, even messier heritage. (You can get a taste of it here.)
Yes you can use "pure" UNIX System V version 4.0 from AT&T bell lab
I am using this this UNIX from 6 Month ago, it's Unix.
pure command line is available Xwindows NOT available present.
from here you can download and install in Oracle Virtual box
By saying one wants ‘pure’ Unix, it is implied that they want the latest version of Bell Lab’s System V. Not GNU/Linux, not BSD, not macOS.
One can indeed still obtain ‘pure’ Unix from its current owner: Xinuos.
The name is now officially SCO UnixWare 7 Definitive 2018, and you can learn about it here:
Xinous also provides OpenServer 5 Definitive 2018 (a descendant of Xenix), and other FreeBSD-based and SCO Unix-based operating systems.
You can compile unix from its source, but that would require the source its self and removing the rest of the code that at this point is useless. the code can be found at: http://www.tuhs.org/Archive/PDP-11/Distributions/usdl/bostic_pwb.tar.gz and compiling it with gcc and nasm.
I would consider UNIX sytem V release 4/5 to be as near as you could get to "real UNIX". Today in December 2016, I consider current Debian Linux, 8,(having and just installed then dumped it.) As having drifted sufficently far away from the 20th Century Philosopy of UNIX, (IMHO), after it dumped the SysV init and broke all my cutomized boot scrips and overwrote my custom config files. Thankfully I have sufficent backups to restore my previous running system. I say the above; as someone who has been using AT&T UNIX, in its various incarnations for way on almost 40 years. To do useful work with my systems rather thanspend all day tinkering with it. I am now looking for a way to bring up a fully functional SystemV R4 or 5 from the source code if need be. First thing is finding a K&R complient c compiler and other tools without too much hacking. But wonder if anyone has been here before me. My machines have AMD multicore x64 processors in them. Any help appreciated.
I hope I caught you in time before you got rid of all your scripts and config files. When Debian announced the switch to systemd, lots and lots of people did not like it and enough hated it enough to fork a distro with init intact from the stable branch. https://devuan.org/
In so far as UNIX, thus far, my investigation has led me to Lumios (and Solaris --still free if you are a developer or a tinkerer rather than a business) and Solaris as the closest to System V r4 but able to take full advantage of modern hardware. If you are happy with a BSD based version then I would vote for OpenBSD or OpenDarwin rather than FreeBSD because of the enhanced security. Incidentally, that is why I liked Lumios; they update their security far more often than Oracle (for the free version, once a year) and, even though they got there taking different roads, Lumios is functionally, IMHO, Solaris 11.3.
Now, if Bell Labs could be resurrected...