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:<code>/usr</code>
|The "user file system": originally the directory holding user home directories,<ref name="notes72"/> but already by the Third Edition of [[Research Unix]], ca. 1973, reused to split the operating system's programs over two disks (one of them a 256K fixed-head drive) so that basic commands would either appear in <code>/bin</code> or <code>/usr/bin</code>.<ref name="reader">[[Doug McIlroy|M. D. McIlroy]] (1987). [http://www.cs.dartmouth.edu/~doug/reader.pdf A Research Unix reader: annotated excerpts from the Programmer's Manual, 1971–1986]. CSTR 139, Bell Labs.</ref> It now holds executables, libraries, and shared resources that are not system critical, such as the [[X Window System]], [[window manager]]s, [[scripting language]]s, etc. In older Unix systems, user home directories might still appear in <code>/usr</code> alongside directories containing programs, although by 1984 this depended on
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