In the twenty-fourth century, there is still an operating system called "Red Hat Enterprise Linux", and many of its features would still be recognizable to a Unix beard from the twentieth -- the "shell" environment, for instance, is still very nearly the same as it was in 2001, despite no fewer than 42 separate attempts to replace it with something less terrible, many of which are also shipped in the default install for your hacking pleasure, or lack thereof -- but dig deep enough into the manual and you will begin to notice references to an "oversight" layer. Keep following those threads, and the truth will become clear:

The operating system running on the bare metal is not an implementation of Unix at all. It's a variant of a Corellian OS usually referred to as C/RM ("Crystal Runtime Monitor", because it was developed for the first generation of Corellian computers built around isolinear memory crystals), and it is faithfully emulating the POSIX APIs and everything on top of that. As best anyone can tell from available records, this arrangement was originally developed at the actual Red Hat, Inc. in the early 2000s, as a quick hack to run Earth-native software applications unmodified on the much more powerful Corellian computer hardware that was becoming available following First Contact.

C/RM is better known in the modern galaxy as the operating system powering Industrial Automaton's R-series astromech droids. It's not the ideal choice for a droid runtime, if we're honest, but so many aftermarket hardware and software mods have been developed for R-series droids that the low-level programming interfaces are essentially set in stone now.

there, now we just need an equally ridiculous but completely unrelated explanation for why there's a planet named "Core" in the "Fedora" system.