This standard 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
The FHS defines the /usr/local as the “tertiary hierarchy for local data installed by the system administrator.” Translated into English, this means put apps you build yourself here. Think of /usr/local as a “safe haven” for command-line, open sou