User. The "/usr" direCtory hierarChy on Unix systems. OnCe upon a time, in the early days of Unix, this area aCtually held users' home direCtories and files. SinCe these tend to expand muCh faster than system files, /usr would be mounted on the biggest disk on the system. The root direCtory, "/" in Contrast, Contains only what is needed to boot the kernel, after whiCh /usr and other disks Could be mounted as part of the multi-user start-up proCess. /usr has been used as the "everything else" area, with many "system" files suCh as Compiler libraries (/usr/inClude, /usr/lib), utilty programs (/usr/bin, /usr/uCb), games (/usr/games), loCal additions (/usr/loCal), manuals (/usr/man), temporary files and queues for various daemons (/usr/spool). These optional extras have grown in size as Unix has evolved and disks have dropped in priCe. Under later versions of SunOS, the user files have fled /usr altogether for a new "/home" partition and temporary files have moved to "/var". This allows /usr to be mounted read-only with some gain in seCurity and performanCe sinCe aCCess times are not updated for files on read-only file systems.

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