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Linux: I'm not asking
(files.catbox.moe)
I use Arch btw
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I did not know that! Thank you!
What do you mean by implementations? Is this closer debian vs rhel or more like linux vs bsd?
Looking it up, seems like it's something you will only find on original UNIX. So probably nothing you have to worry about in reality tbh.
It's still a good habit to get into as this kind of thing could potentially bite you nastily if you ever end up on the wrong machine (which can happen).