The Portable Operating System Interface (POSIX; ) 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 man
POSIX is a set of standards created by the IEEE Computer Society that helps different operating systems work together by defining common programming interfaces, command shells, and commands. It matters because it allows software and systems to be more compatible across different platforms, whether they're traditional Unix systems or Unix-like systems.
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The Portable Operating System Interface (POSIX; ) 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). POSIX also defines a standard threading library API which is supported by most modern operating systems.
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