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Practically universal. Even if there's a Linux distro going out of it's way not to set them, many tools, including big ones, support it anyway (also on non-Linux Unices). In practice I've never encountered users with a distro that didn't have these variables set.

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>Practically universal

"I use Ubuntu and develop in full stack JavaScript so everyone else does too."

No, it is not "practically universal". Alpine Linux, MacOS, FreeBSD, illumos UNIX distros, etc. do not follow this imposed "standard".

>Even if there's a Linux distro going out of it's way not to set them

You have this backwards. The systemd standard is imposed on Linux, not the other way around.

>In practice I've never encountered users with a distro that didn't have these variables set.

"I use Ubuntu and develop in full stack JavaScript so everyone else does too."

You can invent quotes all you want, I neither use Ubuntu, do webdev, or think that you make any factual arguments.

I don't have XDG environment variables set in OpenWRT or ASUSWRT, the two Linux distros I run on personal equipment in my house. Also not set on my installs of FreeBSD.

You do know the difference between practically all and exactly all?

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