Filesystem Hierarchy Standard
/usr is the second major section of the filesystem.
/usr is shareable, read-only data. That means that /usr
should be shareable between various FHS-compliant hosts and
must not be written to. Any information that is host-specific or
varies with time is stored elsewhere.
Large software packages must not use a direct subdirectory under the
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Translated by troff2html v1.5 on 29 March 2002 by Daniel Quinlan