The Open Group and IEEE have released the IEEE Std 1003.1-2024 standard and Open Group Standard Base Specifications, Issue 8, which comprise a set of interface standards for developing operating systems that ensure program compatibility.
POSIX is an API standard for various programs, including those written in C language and shell scripts, ensuring that these programs work seamlessly anywhere.
Despite being a relatively new standard, additional commands and APIs are often already present in many operating systems, such as the gettext, realpath, and xgetext commands. Some commands have fallen out of favor, like fort77 or batch job control commands like qalter, qdel, qhold.
The POSIX standard is the foundation of Linux, as on July 3, 1991, Linus announced his intention to create an operating system compatible with the POSIX standard for x86 machines.
Source: IEEE
TLDR: The Open Group and IEEE set industry standards for OS development, ensuring program compatibility. POSIX standardizes APIs for various programs, while also influencing the development of Linux.
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