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Portable Operating System Interface

<operating system, standard> (POSIX) A set of IEEE standards designed to provide application portability between Unix variants.

IEEE 1003.1 defines a Unix-like operating system interface, IEEE 1003.2 defines the shell and utilities and IEEE 1003.4 defines real-time extensions.

["More UNIX For Dummies", ISBN: 1-56884-361-5] says it stands for "Portable Operating System Interface with an X thrown in to make it sound cooler."

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Portable Common Tool Environment Portable Document Format Portable Forth Environment Portable Network Graphics Portable Object Adapter	Portable Operating System Interface POSIX	Portable Pixmap Portable Scheme Debugger Portable Scheme Interpreter Portable Standard Lisp Portable Tool Interface