Posix
Posix Versions
| Period | IEEE | Details |
|---|---|---|
| POSIX.1 | IEEE Std 1003.1-1988 | Core Services (incorporates Standard ANSI C) |
| POSIX.1b | IEEE Std 1003.1b-1993 | Real-time extensions (later appearing as librt—the Realtime Extensions library) |
| POSIX.1c | IEEE Std 1003.1c-1995 | Threads extensions. |
| POSIX.2 | IEEE Std 1003.2-1992 | Shell and Utilities. |
| POSIX.1-2001 | IEEE Std 1003.1-2001 | Single UNIX Specification version 3. |
| POSIX.1-2008 | IEEE Std 1003.1-2008, 2016 Edition | - |
| POSIX.1-2017 | IEEE Std 1003.1-2017 | - |