That's a weird objection. Linux isn't UNIX, technically. All of the current and former UNIXes had various incompatibilities. /proc was never standardized. /

That's a weird objection. Linux isn't UNIX, technically. All of the current and former UNIXes had various incompatibilities. /proc was never standardized. /dev has some standard names, but not many. Not sure what you mean about /etc, that's up to whatever's installed in userland. systemd is more or less Linux only; it's weird to blame other OSes for not having it. (The funny thing is that systemd has functionality in part inspired by macOS's launchd.) The ext* family of filesystems (and certainly stuff like btrfs) is a Linux thing; other UNIXes used different file systems. CLI utils are an interesting thing: the BSDs have always(?) had their own, and don't use GNU coreutils (which is what Linux uses). There wasn't really much coordination over the decades, so they went in different directions. Most (all?) of them should be POSIX-compliant (possibly after setting an env var, at least in GNUs case), so if you restrict yourself to functionality specified in POSIX, you should be fine. I don't really like macOS, but your specific criticism of it doesn't really hold water. If you're going to hate on macOS for this stuff, then you also have to hate on all the BSDs, which seems a little silly and unwarranted. > with the mac you can start off thinking things would work, but they don't. If you're expecting things to work on macOS just like on Linux, then your expectations were way off in the first place. If you want cross-platform compat in these areas, you'll have to stick with POSIX. Which sucks, especially since no one really implements POSIX correctly, but that's just how it is, and has always been.