POSIX

Portable Operating System Interface.

The Portable Operating System Interface specification.

Acronym for portable operating system interface for computer environments. A Federal Information Processing Standard Publication (FIPS PUB 151-1) for a vendor-independent interface between an operating system and an application program, including operating system interfaces and source code functions. Note: IEEE Standard 1003.1-1988 was adopted by reference and published as FIPS PUB 151-1.