POSIX

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

command line interpreter for operating systems

industry consortium working for open, unified standards for Unix systems

abstract indicator (handle) used to access a file or other input/output resource

family of standards for computer operating systems, compliance with which is required to qualify for using the "UNIX" trademark

execute a file (a library function and/or a system call)

Unix system call

specification of a C standard library for POSIX systems; includes additional functions to those introduced in standard C

group of linked processes executing in a Unix-like system

working group for the Single UNIX Specification

system call used in many computer operating systems