POSIX is an acronym for Portable Operating System Interface, a set of standards defining programming APIs and utility behavior for Unix-like operating systems.
POSIX(an acronym for "Portable Operating System Interface") is a family of standards that specifies the behaviour of Unix-like operating systems.
These standards define:
- A standard operating system interface and environment.
- A programming API for the C programming language.
- The behavior of a command interpreter (or “shell”).
- The behavior of common utility programs invocable from the shell.
The current set of POSIX standards is available online.