> Huh? What is specific to Linux in this post?

Perhaps nothing? I was responding to the complaint in general terms.

> Your irritation is way off base.

Please allow me to feel irritated when people refer to obvious Linux things as something that's supposedly got something to do with Unix. It happens often enough.

Fair enough; I suppose it’d be annoying for people to talk about “the Unix concept of cgroup namespaces” or something like that.

I had thought that you were directly responding to the original poster.

Most popular Unix-like OS on consumer devices is Linux (Android). Most popular Unix-like OS on servers is Linux. Most popular Unix-like OS in embedded is Linux. Most popular Unix-like OS on supercomputers is Linux. Most popular Unix-like OS on IBM PC compatible computers or notebooks is MS Windows with WSL.

Most popular Unix-like OS on MacBooks is MacOS.

Android is not a Unix-like OS, other than having a kernel that was originally devised as a Unix clone. Beyond that, I’m not sure what your point is. Is it just that “most popular” is ill-defined?

To bring us back to the context of this post: I am quite willing to bet that “grep” and “cat” are used by humans more times per day on macOS than on any other OS.