I'm not advocating a rename here, really, just curious. It seems like out of the "unix and linux" scope advertised, the vast majority of the questions are either Linux or generic *nix. What was the rationale for picking unix for the subdomain over linux, or perhaps nix?
We didn't have any say in that, the domain was assigned, and I imagine whoever handled it didn't put a lot of thought into it (that was back before we realized the domain would be permanent -- when our beta started it was still the plan to buy top-level domains when sites launched). Some sites have multiple subdomains in case of confusion, and https://linux.stackexchange.com/ will work as well; they probably just made the primary one https://unix.stackexchange.com/ because Unix appears first in the name
"unix" is a widely recognized name, and even most of the users here know that 'UNIX(tm)-like' topics will apply to their situation.
This is not simply a SE problem, but the entire community has a problem coming up for the magic name that describes this the vast ecosystem of questions posed by "users of Linux, FreeBSD and other Un*x-like operating systems.".
The current and potential users of this site use Linux-based-operating systems, MacOSX, FreeBSD, Solaris, NanoBSD, OpenWRT and more. These operating systems, as well as concepts like 'Posix', share a lot in common. Users will have many of the same questions, and most of the answers here will often apply to many different operating systems.
Would a name like "linux.stackexchange.com" be better? Wouldn't that exclude FreeBSD, Solaris & MacOSX users? Just to make a point: 'Linux' is a kernel (or maybe it's a project?), not an operating system. Would questions regarding bash-shell or be appropriate on "linux.stackexchange.com"?
unix.stackexchange.com is better then a name like "gnu-linux_FreeBSD_Solaris_MacOSX_Posix_and_other_related_operating_systems.stackexchange.com".
'nix.stackexchange.com' sounds cool to me, but I'm sure it would be confusing to many people. A Lice Shampoo?
Whatever the answer, it needs to fit into the limitations of the DNS system. I would love a name like 'un*x.stackexchange.com', but that just won't work.
FWIW, unix.se exists.