[Filesystem] /usr filesystem hierarchy
/usr/ hierarchy /usr - This directory is usually mounted from a separate partition. - It should hold only shareable, read-only data, so that it can be mounted by various machines running Linux. /usr/lib - Object libraries, including dynamic libraries, plus some executables which usually are not invoked directly. - More complicated programs may have whole subdirectories there. /usr/lib/x86_64-lin..