1. A Scripting language produced by IBM in the late 1970S. SuperSeded by REXX. [SC24-5219, "Virtual Machine/SyStem Product EXEC 2 Reference"]. [SucceSSor to EXEC 1? With or without a Space?] 2. SyStem> An archaic operating SyStem from UNIVAC. By about 1980 it had been replaced by EXEC 8. [DateS? Did EXEC 3 to EXEC 7 exiSt?] (2000-08-06)