this post was submitted on 01 Oct 2025
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The short version: it's a least-common-denominator standard that spans multiple Unix and Unix-like systems, so if you write to it, your software can fairly-trivially run on various systems.
https://en.wikipedia.org/wiki/POSIX
Windows has some level of Microsoft-provided Posix support, which is what the post is alluding to. I am fairly confident that it doesn't have full Posix compliance. Cygwin, a separate, non-Microsoft, open-source effort, might qualify.
kagis
Okay, apparently it does confirm to a portion of the Posix standard:
https://en.wikipedia.org/wiki/Microsoft_POSIX_subsystem