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== External links == * [https://www.opengroup.org The Open Group], opengroup.org—resulted from merger of X/Open Company and Open Software Foundation * [https://unix.org/what_is_unix.html What is UNIX?], unix.org * [https://bitsavers.computerhistory.org/pdf/xOpen/X_Open_Portability_Guide_1985/ X/Open Portability Guide], issue 1, 1985 {{authority control}} {{DEFAULTSORT:X Open}} [[Category:History of software]] [[Category:Software engineering papers]] [[Category:Standards organisations in the United Kingdom]] [[Category:Technology consortia]] [[Category:Unix history]] [[Category:Unix standards]]
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