SCO Unix (Openserver, not UnixWare which they bought from USL (now owned by Novell)) is by all accounts a greater "travestite."
I'm an old Coherent fan myself and never much cared for Openserver, especially in terms of the outrageous price, poor support and draconian licensing policies. Frankly I'm not a great fan of SysV either and the more BSD the kernel gets the better.
All of this ignores the fundamental fact thet the above "true Unices" are all de facto kernels for the various GNU/**ix operating sysetems. I've used GNU/Ultrix, GNU/hp/ux, GNU/Solaris, and GNU/Coherent and all are tolerable. Putting me in the SysV userland where the true believers want me would be hell.
By the way, coherent is not UNIX either and depends not on AT&T code.
UNIX is a registered trademark of the Open Group in the United States and other countries.
UNIX is available as a branding for operating systems which are certified by the open group to comply to various levels of the Single Unix Specification, a national and international standard. One such system, compliant at Unix95 level is OS/390 by Ibm with compatability extensions. This system is stated by the Open Group to not be derived from any AT&T code.
You can find out more about the Single Unix Specification and UNIX in general at www.unix.org. While you're there you can familiarize yourself with the terms of their "license."
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SCO Unix (Openserver, not UnixWare which they bought from USL (now owned by Novell)) is by all accounts a greater "travestite." I'm an old Coherent fan myself and never much cared for Openserver, especially in terms of the outrageous price, poor support and draconian licensing policies. Frankly I'm not a great fan of SysV either and the more BSD the kernel gets the better. All of this ignores the fundamental fact thet the above "true Unices" are all de facto kernels for the various GNU/**ix operating sysetems. I've used GNU/Ultrix, GNU/hp/ux, GNU/Solaris, and GNU/Coherent and all are tolerable. Putting me in the SysV userland where the true believers want me would be hell. By the way, coherent is not UNIX either and depends not on AT&T code.
UNIX is a registered trademark of the Open Group in the United States and other countries. UNIX is available as a branding for operating systems which are certified by the open group to comply to various levels of the Single Unix Specification, a national and international standard. One such system, compliant at Unix95 level is OS/390 by Ibm with compatability extensions. This system is stated by the Open Group to not be derived from any AT&T code. You can find out more about the Single Unix Specification and UNIX in general at www.unix.org. While you're there you can familiarize yourself with the terms of their "license."