# UNIX V7

> Version 4 of the Single UNIX Specification

**Wikidata**: [Q105989599](https://www.wikidata.org/wiki/Q105989599)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/UNIX_V7)  
**Source**: https://4ort.xyz/entity/unix-v7

## Summary
UNIX V7 is Version 4 of the Single UNIX Specification (SUSv4), a technical standard defining the requirements for an operating system to be certified as UNIX-compliant. Released as SUSv4-2018, it succeeded UNIX 03 (Version 3) and ensures interoperability across UNIX-like systems. It is distinct from earlier UNIX operating systems like AT&T UNIX or UnixWare.

## Key Facts
- **Aliases**: Single UNIX Specification version 4, SUSv4-2018.
- **Preceded by**: UNIX 03 (Version 3 of the Single UNIX Specification).
- **Instance of**: Technical standard, specifically a version of the Single UNIX Specification.
- **Different from**: AT&T UNIX, UNIX System V, UnixWare, and Version 7 Unix (the latter being an older AT&T UNIX release).
- **Sitelink count**: 2 (Wikipedia pages in English and German).
- **Wikipedia title**: UNIX V7 (with translations in German and English).

## FAQs
### Q: What is UNIX V7?
A: UNIX V7 is Version 4 of the Single UNIX Specification (SUSv4), a standard defining UNIX compliance for operating systems, released as SUSv4-2018.

### Q: How does UNIX V7 differ from other UNIX versions?
A: Unlike AT&T UNIX or UnixWare, UNIX V7 is a certification standard, not an operating system. It succeeded UNIX 03 and updated interoperability requirements.

### Q: Is UNIX V7 related to the original 1979 Version 7 Unix?
A: No. UNIX V7 refers to the 2018 standard (SUSv4), while "Version 7 Unix" is a 1970s AT&T operating system. They are distinct entities.

## Why It Matters
UNIX V7 (SUSv4) is critical for maintaining consistency and interoperability across modern UNIX-like systems. As a technical standard, it ensures software portability and compatibility, allowing developers to create applications that work across certified platforms. By evolving from UNIX 03, it addressed emerging technologies and user needs, solidifying its role in enterprise and embedded systems. Its distinction from proprietary UNIX variants (e.g., UnixWare) underscores its neutrality and broad applicability, making it a foundational reference for operating system design and certification.

## Notable For
- **Latest SUS version**: The fourth iteration of the Single UNIX Specification, updated in 2018.
- **Successor to UNIX 03**: Built on and refined the preceding standard (Version 3).
- **Neutral standard**: Distinguished from proprietary UNIX operating systems like AT&T UNIX.
- **Multilingual recognition**: Documented in both English and German Wikipedia entries.

## Body
### Version History
- **Predecessor**: UNIX 03 (Version 3 of the Single UNIX Specification).
- **Release**: Designated SUSv4-2018, reflecting updates through 2018.

### Specifications
- **Purpose**: Defines APIs, utilities, and shell requirements for UNIX certification.
- **Scope**: Governs interoperability, excluding specific implementation details.

### Differentiation
- **Not an OS**: Unlike UNIX System V or UnixWare, it is a standard, not an operating system.
- **Certification role**: Ensures compliance for systems like Linux (via POSIX alignment) or BSD derivatives.

### Recognition
- **Documentation**: Covered in English and German Wikipedia articles, with 2 sitelinks.
- **Technical context**: Part of the broader POSIX compliance ecosystem, though not identical to POSIX standards.