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My fellow software engineer, It's the year 2024...
(mastodon.social)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
So yes, "XDG" stands for "Cross-Desktop Group" - but I don't agree that using the spec assumes a windowing system. The base directory spec involves checking for certain environment variables for guidance on where to put files, and falling back to certain defaults if those variables are not set. It works fine on headless systems, and on systems that are not XDG-aware (I suppose that means systems that don't set the relevant env vars).
OTOH as another commenter pointed out the base directory spec can make software work when it otherwise wouldn't on a system that doesn't have a typical home directory layout or permissions.