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I always thought /usr was for "user".... TIL
It is, this infographic is wrong. Or I guess technically some other standard could define it like the infographic, but the Filesystem Hierarchy Standard defines it as a secondary hierarchy specifically for user data.
/usr used to be the user home directory on Unix...well most of them. I think Solaris/SunOS has always been /export/home as I recall.
It did, let me explain:
On the original (ie Thompson and Ritchie at Bell in 1969-71), I think it was a PDP-11, they installed to a 512kb hard disk.
As their "stuff" grew they needed to sprawl the OS to another drive, so they mounted it under /usr and threw OS components that didn't fit.
https://landley.net/writing/unixpaths.pdf
I've done the same, outgrew so you mount under a tree to keep going, it just never became a historical artifact.
Huh. I did as well. Like /use/bin was for user installed applications and such. You learn something everyday.