在http://www.unix.org/version3/注册也可以下载。对操作系统编写人员有用：TheSingleUNIXSpecificationVersion3-incorporatingIEEEStd1003.1andISO/IEC9945andintegratingtheindustry'sOpenSystemsstandards.PressReleaseOverviewPaperISO/IEC9945:2003IEEEStd1003.1-2001TheAustinGroupContentsOrganizationoftheSpec