[arp242]

Curl is a library and CLI though, not a "large application". Makes a difference for things like this. I've written stuff like this that I only tested on Linux and macOS, and then it "just worked" on Android and iOS without modifications.

What is or isn't a separate "operating system" is always a bit fuzzy and depends on which layer you're looking at. Android is "just Linux" on some levels, but also clearly isn't on others. But also: Debian really is quite different from, say, Chimera Linux, or Alpine. But it's also very similar.

It also lists illumos and OmniOS for example, and it could be argued that it's really just one system. Same with Linux and ucLinux, and probably a few others.