(FHS) A
standard designed to be used by
Unix distribution developers,
package developers, and
system implementors.
FHS consists of a set of
requirements and guidelines for
file and directory placement under
UNIX-like operating systems.
The guidelines are intended to support interoperability of
applications, system administration tools, development tools,
and scripts. These systems should also be supported with
greater documentation uniformity.
The standard is primarily intended to be a reference and is
not a tutorial on how to manage a Unix filesystem or directory
hierarchy.
http://pathname.com/fhs/.
RedHat deviation.