The Open Group Standards
Open Group
POSIX.1 is the portable Unix API — published and indexed by The Open Group, co-maintained with IEEE.
What It Is
Maintains POSIX (with IEEE), UNIX certification, TOGAF enterprise architecture, and ArchiMate modeling language.
Taxonomy
By standard family: POSIX · UNIX · TOGAF · ArchiMate · Open Footprint
Top-Level Categories
Master Catalog
Sub-Indexes & Guides
Global consortium that maintains the Single UNIX Specification (SUS) and co-publishes POSIX (IEEE Std 1003.1) with the Austin Group (joint IEEE/The Open Group committee). POSIX defines the portable API for Unix-compatible systems: process model, file I/O, signals, sockets, and threads. The Open Group also certifies UNIX conformance for commercial operating systems.
View all bodies →Curated specs from Open Group
Docker layers, npm pack, Linux package sources, and backup workflows use tar. ustar and PAX extensions define long filenames and metadata.
POSIX defines the lingua franca of Unix/Linux systems programming. Every system call pattern, signal handler, file descriptor idiom, and shell script convention in the Linux/macOS world comes from this spec.