usr does mean user. It was the place for user managed stuff originally. The home directory used to be a sub directory of the usr directory.
The meaning and purpose of unix directories has very organically evolved. Heck, it's still evolving. For example, the new .config directory in the home directory.
For example, the new .config directory in the home directory.
I hope slowly but surely no program will ever dump its config(s) as ~/.xyz.conf (or even worse in a program specific ~/.thisapp/;
The ~/.config/ scheme works as long as the programs don't repeat the bad way of dumping files as ~/.config/thisconfig.txt. (I'm looking at you kde folks..) A unique dir in .config directory should be mandatory.
If I ever need to shed some cruft accumulated over the years in ~/.config/ this would make it a lot easier.
It kind of makes sense on many BIOS/UEFI-less systems where e.g. Uboot is used. And it does contain things like kernel images, sometimes initRD files etc. (which may not be bootloader files but are still system boot files).
It's not wrong, but it feels a bit like some tech articles you'll see which are obviously just created to fluff up a CV. I wouldn't say avyttring here is flat out wrong, just kinda... lacking.
But yeah, /boot holds "system boot loader files", sure, but that's a bit vague. It should contain your kernel and initramcpio and IIRC Grub also had its config here. That's pretty much it. I would've rather said /boot contains the kernel.
"device files" it's so vague that it's almost wrong IMO. At first glaze I would've thought that it means drivers rather than, say, "interfaces to devices"
According to this, it's been around since the 70's and was originally just a catch-all for files that didn't fit in the other default directories, but over time has come to be mostly used for config files. I assume it would cause utter mayhem to try and change the name now so I guess it just sticks. Someone suggested "Edit To Configure" as a backronym to try and make it make more sense if that helps anyone lol.
It meant user, as in user-installed programs and libraries for this system over the core system programs and libraries of the operating system in /bin and /lib.
Someone learned it wrong, but otherwise I think the image is right.
/usr meaning Unix System Resources a backronym IIRC; it was initially meant to hold the user's files and on a separate partition; then root got full on one important machine and binaries deemed non-essential for booting got moved there, and they stayed there even after user data was moved to /home.