Unix standards

industry consortium working for open, unified standards for Unix systems

family of standards for computer operating systems, compliance with which is required to qualify for using the "UNIX" trademark

nonprofit foundation

X/Open group (also known as the Open Group for Unix Systems and incorporated in 1987 as X/Open Company, Ltd.) was a consortium founded by several European UNIX systems manufacturers in 1984 to identify and promote open standards in the field of information technology. More specifically, the original aim was to define a single specification for operating systems derived from UNIX, to increase the interoperability of applications and reduce the cost of porting software. Its original members were Bull, ICL, Siemens, Olivetti, and Nixdorf—a group sometimes referred to as BISON. Philips and Ericsso

struggles between vendors of the Unix computer operating system in the late 1980s and early 1990s to set the standard for Unix thenceforth

early UNIX operating system specification