Solaris and AIX /are/ UNIX. Solaris is derived from SunOS, which is derived from 4.2BSD, which was directly licensed by Sun from AT&T via a UNIX source license

Solaris and AIX /are/ UNIX. Solaris is derived from SunOS, which is derived from 4.2BSD, which was directly licensed by Sun from AT&T via a UNIX source license. Solaris and SunOS were both certified as UNIX. Similarly IBM licensed AT&T UNIX and derived AIX. It is still certified as UNIX. The Open Group holds the UNIX trademark and copyrights and conducts the certification and licensing process these days. See here: https://www.opengroup.org/openbrand/register/ https://www.opengroup.org/openbrand/register/ You've posted functionally the same comment multiple times in this thread. No matter how many times you say it, you are technically incorrect. UNIX is a valid piece of terminology when referring to commercial Unix OSes.