POSIXjärjestelmä

A POSIXjärjestelmä, or POSIX system, refers to an operating system that conforms to the POSIX (Portable Operating System Interface) standards. POSIX is a family of standards developed by the IEEE Computer Society for maintaining compatibility between operating systems. The primary goal of POSIX is to promote portability of applications, meaning that software written for one POSIX-compliant system should be able to run on another with minimal or no modification.

The POSIX standards define a set of programming interfaces, utilities, and shell commands that operating systems should implement. This includes aspects like file system structure, process management, inter-process communication, and basic command-line tools. By adhering to these standards, developers can create applications that are less dependent on the specifics of a particular operating system, such as Linux, macOS, or BSD variants.

While POSIX doesn't dictate the internal design of an operating system, it provides a common ground for the external behavior that applications interact with. This standardization has been crucial in the development of Unix-like systems and has influenced many modern operating systems. A POSIX-compliant system ensures a consistent environment for software development and deployment, making it easier to build and maintain portable software across different platforms. The existence of POSIX has fostered a more open and interoperable computing ecosystem.