POSIX (Portable Operating System Interface of UNIX)

POSIX (Portable Operating System Interface) is a family of standards specified by the IEEE for maintaining compatibility between operating systems. It defines the application programming interface (API), along with command line shells and utility interfaces, for software compatibility with variants of Unix and other operating systems. Below are some of the main POSIX standard versions:

  • POSIX.1 (1988): System Application Program Interface.

  • POSIX.2 (1992): Shell and Utilities.

  • POSIX.1b (1993): Real-time extensions.

  • POSIX.1c (1995): Threads extensions.

  • POSIX.1d (1999): Additional real-time extensions.

  • POSIX.1j (2000): Advanced real-time extensions.

  • POSIX.1q (2001): Device Control Interfaces.

  • POSIX.1-2001 (2001): Unified standard, including POSIX.1, POSIX.2, POSIX.1b, POSIX.1c, and others.

  • POSIX.1-2004 (2004): Revision, including previous versions with updates and corrections.

  • POSIX.1-2008 (2008): Also known as IEEE Std 1003.1-2008, includes many fixes and new feature extensions. See IEEE P1003.1, Draft 3

  • POSIX.1-2017 (2017): Updates and corrections.

  • POSIX.1-2024 (2024): The latest revision, which includes further updates and corrections.