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March 19, 2024

SUS: Single UNIX Specification

March 19, 2024
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SUS: Single UNIX Specification, also known as the Single UNIX Standard, is a computer industry standard that defines the application programming interface (API), shell interface, and other specifications for Unix-like operating systems. It provides a standard set of software interface definitions for various Unix-like systems, ensuring compatibility and portability across different platforms.


The Single UNIX Specification was developed by the Open Group, an industry consortium dedicated to promoting open standards and interoperability. The standard was first published in 1997 and has since undergone several revisions to keep up with the evolving technologies and requirements of the IT industry.

The goal of SUS is to ensure a high degree of compatibility between different Unix-like operating systems, enabling software applications to run seamlessly across multiple platforms. By adhering to the specifications defined in SUS, software developers can write code that is portable and compatible with various Unix-like systems, reducing the effort required to develop and maintain applications for different platforms.


One of the key advantages of SUS is its ability to promote interoperability and portability. By providing a standard set of APIs and specifications, SUS enables software developers to write code that can be executed on different Unix-like systems without requiring extensive modification. This saves time and effort during the development process and allows software vendors to target a wider audience.

SUS also ensures a high degree of compatibility between different Unix-like systems. This means that software applications developed for one Unix-like system can be easily ported to another system without major modifications. This not only simplifies the migration of software across platforms but also reduces the cost and effort associated with maintaining multiple versions of the same application for different systems.


The Single UNIX Specification has been widely adopted by various Unix-like operating systems, including Linux, macOS, AIX, HP-UX, and Solaris, among others. This means that software developers targeting these systems can rely on SUS to ensure compatibility and portability.

SUS is particularly beneficial in the context of software development, as it allows developers to write code that can be compiled and run on different Unix-like systems without significant modifications. This enables software vendors to reach a larger customer base and facilitates the deployment of applications across multiple platforms.

Furthermore, SUS is also important for system administrators and IT professionals who manage Unix-like systems. By adhering to the Single UNIX Specification, these professionals can ensure compatibility and interoperability between different systems, making it easier to integrate and manage heterogeneous IT environments.


The Single UNIX Specification, or SUS, plays a crucial role in promoting compatibility and portability across Unix-like operating systems. By providing a standard set of software interface definitions, SUS enables software developers to write applications that can run on different platforms without requiring extensive modifications. This not only saves time and effort but also facilitates the migration and management of software across systems. As a widely adopted industry standard, SUS ensures the interoperability of Unix-like systems and contributes to the efficiency and effectiveness of software development and IT management in the information technology sector.

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