Linux is a kernel, so it can't be a Unix. Inspur K-UX, on the other hand, is a Linux distribution which is a Unix https://en.wikipedia.org/wiki/Inspur_K-UX ht

Linux is a kernel, so it can't be a Unix. Inspur K-UX, on the other hand, is a Linux distribution which is a Unix https://en.wikipedia.org/wiki/Inspur_K-UX https://en.wikipedia.org/wiki/Inspur_K-UX > Inspur K-UX 2.0 and 3.0 for x86-64 were officially certified as UNIX systems by The Open Group. [snip] > Inspur K-UX 2.0 was one of six commercial operating systems that have versions certified to The Open Group UNIX 03 standard (the others being macOS, Solaris, IBM AIX, HP-UX, and EulerOS). More: https://en.wikipedia.org/wiki/Unix https://en.wikipedia.org/wiki/Unix > Systems that have been licensed to use the UNIX trademark include AIX,[35] EulerOS,[36] HP-UX,[37] Inspur K-UX,[38] IRIX,[39] macOS,[40] Solaris,[41] Tru64 UNIX (formerly "Digital UNIX", or OSF/1),[42] and z/OS.[43] Notably, EulerOS and Inspur K-UX are Linux distributions certified as UNIX 03 compliant.[44][45] None of the Open Source BSDs are on that list.