"Spec 1170" was the working name of the standard UNIX programming interface specification that is now known as X/Open Programming Guide 4.2 (XPG 4.2). The specification has also been known as the "Single UNIX Specification" and, most recently, as "UNIX 98." In the "Spec 1170" or first version of the Single UNIX Specification, there were 1,170 C language functions or individual instructions.
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