As ECS and CONTROL-M are becomming more and more utilized in the Unix environment, it is important to have standardized return codes from the various scripts being scheduled. Most programs scheduled through ECS to run on the UNIX systems are currently run through shell scripts. From within the shell scripts, we have the ability to standardize the return codes received by ECS and CONTROL-M. The following is a list of standardized return codes which should be implemented across all shell scripts on all UNIX machines: