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The Single UNIX Specification (SUS) is a standard for computer operating systems, [1] [2] compliance with which is required to qualify for using the "UNIX" trademark.The standard specifies programming interfaces for the C language, a command-line shell, and user commands.
Version 7 Unix, also called Seventh Edition Unix, Version 7 or just V7, was an important early release of the Unix operating system. V7, released in 1979, was the last Bell Laboratories release to see widespread distribution before the commercialization of Unix by AT&T Corporation in the early 1980s. V7 was originally developed for Digital ...
AIX is based on UNIX System V with 4.3BSD-compatible extensions. It is certified to the UNIX 03 and UNIX V7 specifications of the Single UNIX Specification, beginning with AIX versions 5.3 and 7.2 TL5, respectively. [6] Older versions were certified to the UNIX 95 and UNIX 98 specifications. [7]
Below are other certified Unix operating systems: [4] macOS: Heavily based on BSD, macOS is registered as certified Unix 03 brand on both versions (Intel and Apple silicon-based). SCO OpenServer: Another operating system by SCO. Registered as Unix 93 “single and Multi-processor Industry Standard Intel architecture platform”.
LSB compliance might be certified for a product by a certification procedure. [ 1 ] LSB specified standard libraries (centered around the ld-lsb.so ), a number of commands and utilities that extend the POSIX standard, the layout of the file system hierarchy , run levels , the printing system, including spoolers such as CUPS and tools like ...
There are a number of Unix-like operating systems based on or descended from the Berkeley Software Distribution (BSD) series of Unix variant options. The three most notable descendants in current use are FreeBSD, OpenBSD, and NetBSD, which are all derived from 386BSD and 4.4BSD-Lite, by various routes.
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Unix vendor SCO Group Inc. accused Novell of slander of title. The present owner of the trademark UNIX is The Open Group, an industry standards consortium. Only systems fully compliant with and certified to the Single UNIX Specification qualify as "UNIX" (others are called "Unix-like").