Portable Operating System Interface (POSIX)

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Portable Operating System Interface (POSIX) is defined by POSIX.1-2017 as a standard operating system interface and environment, including a command interpreter (or “shell”), and common utility programs to support applications portability at the source code level. It is intended to be used by both application developers and system implementors.

Source: IEEE 1003.1-2017 - IEEE Standard for Information Technology--Portable Operating System Interface (POSIX(R)) Base Specifications