Unix on Raven's Blog | Linux and IT

POSIX (Portable Operating System Interface)

Wed, 24 May 2023 00:00:00 +0000

Greetings!

We continue growing the Linux user’s glossary. Today we’ll talk about the term POSIX.

Wikipedia gives the following definition of this term:

POSIX (Portable Operating System Interface) is a set of standards describing the interfaces between the operating system and an application program (system API), the C language library, and a set of applications and their interfaces. The standard was created to ensure compatibility between various UNIX-like operating systems and portability of application programs at the source code level, but it can also be used for non-Unix systems.

Unix Operating System

Sun, 20 Feb 2022 00:00:00 +0000

Greetings!

The Unix operating system is considered one of the most important in the history of computer OS development. The ideas embedded in this system during its development remain relevant and are regularly used today.

For example:

the principles of how the file system works;
the file hierarchy;
the “Everything is a file” concept;
multitasking;
multi-user sessions;
the broad functionality of the command shell;
and much more.

Historical hierarchy of Unix OS and Unix-like systems: