Working With Unix Variant Differences

One thing is for certain: Unix is complicated. Linux does it one way, Solaris another, and all the BSDs, yet another. Fortunately there is some logic behind the differences. Some differences have to do with where the OS came from, and some were deign choices, intended to improve usability. In this article we’ll talk about a few major differences between the Unix variants, and tell you what you need to know about various differences in command-line utilities.

Systems

First, recall that Unix started off in research labs, and two main flavors came about: System V (SysV), and BSD. SysV (five, not “vee”) spawned from AT&T Unix, in their fourth version, SVR4. BSD, from Berkeley, is the competing Unix variant. They both derived from the same Unix from Bell labs, but quickly diverged. Despite POSIX efforts, there are still BSD and SysV systems today, and their functionality still diverges.

Most operating systems are pretty clearly associated with one or the other...
http://www.longitudetech.com/linux-unix/working-with-unix-variant-differences/
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For over 5 years I worked only with RHEL/centos since it is popular as a web-server platform. Lately, I've been busy learning new things. Cheesy

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