What is the latest version of the Single UNIX Specification?
The latest version is the Single UNIX Specification Version 3. The 2004 edition of the Single UNIX Specification was published on April 30th 2004, and updates the 2001 and 2003 editions of the specification to include Technical Corrigendum 1 (TC1) and Technical Corrigendum 2 (TC2). It consists of The Open Group Base Specifications Issue 6 and the X/Open Curses, Issue 4, Version 2 specification. The Single UNIX Specification uses The Open Group Base Specifications, Issue 6 documentation as its core.