CMS EXEC, or EXEC, is an interpreted, command procedure control, computer programming language used by the CMS EXEC Processor supplied with the IBM Virtual Machine/Conversational Monitor System (VM/CMS) operating system.
EXEC was written in 1966 by Stuart Madnick at MIT on the model of CTSS RUNCOM. He originally called this processor COMMAND, and it was later renamed EXEC.
CMS EXEC has been superseded by EXEC 2 and REXX. All three — CMS EXEC, EXEC 2 and REXX — continue to be supported by the IBM CMS product.
Read more about CMS EXEC: The EXEC Language, Sample Code, Related CMS Command Procedure Control Languages