Over deze norm
||Programming languages , their environments and system software interfaces
IEEE Std 1003.1-2001 is one of a family of standards known as POSIX. The family of standards extends to many topics; IEEE Std 1003.1-2001 is known as POSIX.1 and consists of both operating system interfaces and shell and utilities. IEEE Std 1003.1-2001 is technically identical to The Open Group Base Specifications, Issue 6, which comprise the core volumes of the Single UNIX Specification, Version 3.