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POSIX
Family of IEEE standards for compatibility between operating systems
POSIX
The Portable Operating System Interface (POSIX; IPA: ) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. In order to define a level of compatibility, POSIX specifies many aspects of functionality that can be classified as application programming interface (API), command-line shell, and shell commands, originally derived from commonly-found Unix APIs, shells, and commands (partly because Unix was considered manufacturer-neutral). Today, many systems conform to the standard – including branded Unix systems, Unix-like systems, and many systems that were historically unrelated to Unix. The standardized user command line and scripting interface were based on the UNIX System V Bourne shell. Many user-level programs, services, and utilities (including awk, echo, ed) were also standardized, based on UNIX System V versions of them, along with required program-level services (including basic I/O: file, terminal, and network)....
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