That's just not true. There are various BSD systems, AIX, HP-UX, Solaris, etc. still exists, Alpine uses busybox.
Hell, I still see people being stuck with csh scripting sometimes with no alternative (sucks to be them!)
There is some common software that wants to run on all these platforms. Do you or I need to care about that for our Docker build script or whatnot? No, probably not. But that doesn't mean others don't. There's still very much a valid use-case for POSIX, even though it doesn't apply to everything.
Hell, I still see people being stuck with csh scripting sometimes with no alternative (sucks to be them!)
There is some common software that wants to run on all these platforms. Do you or I need to care about that for our Docker build script or whatnot? No, probably not. But that doesn't mean others don't. There's still very much a valid use-case for POSIX, even though it doesn't apply to everything.
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