The distinction between / and / usr might appear to be pointless as well, and nowadays it might be (some distros symlink them together), but previously (especially before initial ramdisks were widespread) stuff in / was whatever was needed to bring up the system enough that it could netmount a shared / usr. There used to be additional hierarchies like / usr/ X11R6, and even a / usr/ etc on some (non-Linux?) systems, but AFAIU everyone agrees their existence makes no sense (anymore?), so much that even FHS doesn’t lower itself to permitting them. Everything is generally configured using files in / etc, possibly with the exception of some of the special snowflakes in / opt the package manager will put config files meant to be edited there and expect the admin to merge any changes in manually, and sometimes put default settings meant to be overridden by them in / usr/ share (see below)-both approaches can be problematic, but the difficulty is with migrating configuration in general, not the FHS as such. Things installed in / opt are for whatever is so foreign and hopeless in not conforming to the usual factoring that you just give up and put it in its own little padded cell (hello, Mathematica) Things installed in / usr/ local are under the admin’s purview and unmanaged one-offs, there are always some but overuse will lead to anarchy Things installed in / usr are under the distro’s purview or otherwise under a package manager, any modifications are on pain of confusing it Things installed in /, if it’s different from / usr, are generally not to be touched The standard is, indeed, excessively vague because it was written to let many existing implementations be conformant as is, though I’d say it’s still more helpful than many other standards with that deficiency. So far this year I have put 686 entries in Include the key words appropriate for eachĮditor I can append an entry or search for So, in the case of subjects A, K, T, or Z,

Is a catch-all for entries of random short Without thinking very hard about which of That is relevant to subjects A, K, T, and Put some new random thing), and still have

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