it's so confusing that the order changes when adding IDENTICAL strings to BOTH filenames. Is this really how it's supposed to be?
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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.
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Humans aren't sorting this though. A computer is.
How should 5.2 and 5.12 be sorted? Numerically 5.12 is less than 5.2. But if it's a version then it's "five dot twelve" and thus 5.12 is greater.
These are contextual things that are very difficult for a computer to know. And trying to guess often just makes things weirder. So they often sort in a way that is at least consistent.