POSIX, for anyone who might need it: https://pubs.opengroup.org/onlinepubs/9699919799/
@vaporeon_ there is a new version of POSIX https://pubs.opengroup.org/onlinepubs/9799919799/
@vaporeon_ (you can only reliably depend on things from POSIX-2001 / Issue 6 and earlier on most operating systems tho; nobody claims POSIX-2024 / Issue 8 or even 2017 / Issue 7 compatibility. but some aspects do still have broad support)
@Lady Thanks! How do I find the earlier versions? I tried going to https://pubs.opengroup.org/onlinepubs, but all the directories are just bunch of numbers and there's a lot of them, I don't know which of them has the earlier versions...
@vaporeon_ for quickly finding it, searching “open group base issue 8” is the magic phrase, at least in duckduckgo