3 UNIX-Like Operating Systems That Aren’t Linux

Joel Lee 31-08-2015

Over the past decade or so, people have really started to confuse “UNIX” with “Linux” Unix vs. Linux: The Differences Between and Why It Matters Before the creation of Linux, the computing world was dominated by Unix. What's the difference between Linux and Unix? Read More as if they are basically the same thing — but that’s not true. It’s a murky area to tread, but the distinction basically comes down to how you define the terms.


UNIX has roots reaching as far back as the 1960s but the name didn’t manifest until the 1970s with the birth of a project named Unics. Over the next few decades, UNIX ended up splitting into many different branches, each with their unique twists.

Linux was not one of those branches.

In fact, Linux was born as an alternative to UNIX Penguin Origins: The History of Linux [Geek History] There's virtually no place you can go without being in contact with Linux - it powers everything from regular computers to the most powerful servers to our handheld mobile devices. Most people who aren't techies... Read More with the goal of being UNIX-compatible, which explains why the two have a lot of similarities and why they are often conflated. In that sense, Linux is a UNIX-like, not a UNIX-based, operating system.

In other words, Linux was influenced by UNIX, but UNIX systems have no relation to Linux. With that said, here are some of the more important UNIX systems that still exist today and are worth knowing about.


The Berkeley Software Distribution, known commonly as BSD, was a derivative of UNIX that launched in 1977 and ceased development in 1995. At its inception, BSD actually had the same code as UNIX at the time, making it a true branch of UNIX.


Though the original BSD no longer exists, it did spawn a bunch of other descendants — called “variants” — many of which are actively developed as open source projects What Is Open Source Software? [MakeUseOf Explains] "Open source" is a term that’s thrown around a lot these days. You may know that certain things are open source, like Linux and Android, but do you know what it entails? What is open... Read More .

The most popular variant is FreeBSD, which is a general purpose operating system that’s feature-complete (unlike Linux, which is just a kernel). This means that the FreeBSD system includes kernel, drivers, utilities, and documentation.


Default installations of FreeBSD lack a graphical interface, but it’s easy enough to install one of the popular desktop environments which are supported out-of-the-box: GNOME, KDE, or Xfce.


The third most popular variant is NetBSD, which focuses more on a clean design and easy portability across computer architectures, meaning it should work without issue on pretty much any machine.

For the most part, NetBSD is used primarily as a basis for large-scale servers and embedded systems rather than personal use.

One of NetBSD’s descendants, called OpenBSD, has actually surpassed its parent in popularity, becoming the second most widely used BSD variant after FreeBSD.



OpenBSD’s primary focus is on transparent code and documentation followed by security. Because of this, OpenBSD is a popular operating system in the security industry. Even so, OpenBSD also supports desktop environments and common open source programs The Best Linux Software and Apps Whether you're new to Linux or you're a seasoned user, here are the best Linux software and apps you should be using today. Read More , making it good for personal use as well.

All of these variants are licensed under the open source BSD license Open Source Software Licenses: Which Should You Use? Did you know that not all open source licenses are the same? Read More , which is one of the most permissive software licenses available. You can pretty much do anything you want with these operating systems.


In 1983, a variant of BSD called SunOS was released. Developed by Sun Microsystems — also known as the pioneers behind the Java platform — SunOS was designed to be more of a workstation and server computer rather than a personal desktop.

But then in 1992, they ditched the BSD-based SunOS and started anew using a more modern (at the time) version of UNIX. This version came to be called Solaris, which still exists today under the name Oracle Solaris (as Sun Microsystems was acquired by Oracle in 2010).



For much of its history Solaris has been a closed source, proprietary project even though Sun often integrated open source solutions into the system (such as OpenWindows, and later, Common Desktop Environment).

But in 2005, everything changed when Sun released the Solaris codebase under a license approved by the Open Source Initiative. This variant, based on Solaris 10, became known as OpenSolaris.

Unfortunately, when Sun was acquired by Oracle, the official OpenSolaris project was shut down. This prompted the community of developers to continue development on their own, resulting in a fork called OpenIndiana based on a new kernel called illumos.


OpenIndiana is the spiritual continuation of the now-defunct OpenSolaris. Several other OpenSolaris derivatives exist, and all of them are based on the illumos kernel (just like how all Linux distributions are based on the Linux kernel), but none are as noteworthy as OpenIndiana.

But at the end of the day, unless you work in an environment of large-scale servers and mainframes, you will probably never have to deal with Solaris or any of its relatives.


A surprising number of people don’t realize that modern Mac systems are derived from a UNIX base. Up until Mac OS 9, Apple’s operating system was built and developed in-house, but they revamped everything in 2001 with the release of Mac OS X (which was later rebranded as OS X in 2012).

When Apple purchased NeXT, Inc. in 1997, they also acquired the NeXTSTEP operating system, which itself was derived from an early version of BSD. This means that modern Macs have more of a claim to a UNIX lineage than even Linux systems Mac OS X Yosemite, From The Perspective Of A Linux User Mac OS X is used as the poster child for a clean and elegant interface. As a Linux writer, it's my duty to make comparisons amongst Linux distros, but also against the competition. Read More !


Prior to OS X, each version of Apple’s operating system was reflected in the name (e.g. Mac OS 9, Mac OS 8, etc). Now, all versions of the UNIX-based operating system since 2001 have been “Version 10” with each major release being given a codename like “Yosemite” (which is technically version 10.10).

As it turns out, the move to UNIX proved successful for Apple when you consider that OS X eventually became the basis of iOS, the operating system that now powers iPhones, iPads, and Apple TVs. It’s arguable that Apple wouldn’t even be on the map if it weren’t for UNIX.

Other UNIX-Like Operating Systems

In addition to the three big names above, there are a few other notable examples of non-Linux UNIX systems worth mentioning.

IBM develops an operating system called AIX, which is mostly used on IBM mainframes and PowerPCs. Hewlett-Packard maintains HP-UX, which is used on the HP 9000 line of workstations and server systems. And then there’s Minix, a microkernel operating system that’s now mostly used for educational purposes.

The bottom line? UNIX is far more prevalent and influential than you might think. The world would be really different if UNIX had never graced the scene.

Which UNIX-like systems did we miss? Did this help clarify what UNIX is? Got any questions that weren’t answered? Share with us in the comments below!

Related topics: Linux, Unix.

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  1. unix forever
    November 5, 2018 at 8:13 pm

    This article isn't all that informative. Solaris is probably the most stable, scalable and powerful Unix that currently exists.

    Also, there maybe could have at least been a mention of Plan9 and Inferno operating systems which are related to Unix in that it was a clean-sheet re-engineered operating system from the same people who originally created Unix and C.

    But if the author of the article finds Solaris to be too opaque, Plan9 would be beyond them.

  2. Aare
    October 31, 2018 at 10:03 pm

    Minix deserves more credit than just 'mostly used for educational purposes'. It's the OS used in every Intel processor to run at privilege level higher than Linux or Windows, in their 'Intel Management Engine'.

  3. Rob
    July 28, 2018 at 8:18 pm

    I miss Unix V5 in the line of originals where it all started. I might even have the original book on the interfaces issued by Bell Labs.

    Also missing is MTS, the Amdahl version of Unix for mainframes. Back in 1984 when I was working at AT&T Bell Labs in Naperville (IL) the were running UTS on the mainframes. Later that was replaced by Unix V5 native on mainframe. It was always a sport to see the max amount of users simultaneously using a mainframe. I've seen it go up to >900 for a single mainframe.

  4. Anonymous
    September 2, 2015 at 4:12 am

    There was a variant called Xenix too. Originally Microsoft owned, spun off into the hated SCO.
    but the original engine behind Altos/Tandy high end business systems.

    • Joel Lee
      September 2, 2015 at 5:14 pm

      You're right! Xenix was pretty popular back in the 1980s, but is now discontinued.

  5. Anonymous
    September 2, 2015 at 2:36 am

    I used to work DEC's Ultrix & Digital Unix (later to become Compaq's Tru64)
    & SGI's IRIX back in the 90s.

    • Joel Lee
      September 2, 2015 at 5:13 pm

      Nice! If you don't mind me asking, what operating system do you use today for home use? :)

      • John T
        December 30, 2015 at 11:33 pm

        I use a couple of Linux variants, mostly Elementary Linux and OpenSUSE. I used to run Solaris until Oracle bought Sun and things went downhill from there for the OS...

  6. Anonymous
    September 2, 2015 at 12:35 am

    and Xinuos

    • Joel Lee
      September 2, 2015 at 5:12 pm

      I missed that one. Thanks Marlin!

  7. Anonymous
    September 1, 2015 at 2:37 pm

    Two points
    1 Precursor to Unix was Multics. Unix was the stripped down version originally a single user Multics.
    2 NeXT Step isn't really derived from BSD, but another beast. It shares more in common with GNU Hurd. For performance reasons they took for Unix Serviced module (a 'server' for a BSD compatible API) and glued it into the Mach kernel.
    We more to Bell Labs and Xerox (especially Xerox PARC) for modern computing than Microsloth

    • Anonymous
      September 2, 2015 at 1:30 pm

      "We more to Bell Labs and Xerox (especially Xerox PARC) for modern computing than Microsloth"
      While you may be correct in absolute terms, if we had waited for Bell Labs and Xerox/Xerox PARC to commercialize their contributions, we'd still be using CLI. Inasmuch as I dislike M$ and Fruitco, the fact is they were the ones to popularize Bell and Xerox contributions.

    • Joel Lee
      September 2, 2015 at 5:10 pm

      Thanks for the clarifications, Evan! Just goes to show that the history surrounding Unix is certainly one of the more complicated histories in computing.

  8. Anonymous
    August 31, 2015 at 11:11 pm

    There's also QNX.

    • Joel Lee
      September 2, 2015 at 5:11 pm

      Thanks for mentioning it. Just saw that QNX has been in development for 33 years and still hasn't died yet. Now that's quite a feat!