Time Sharing Option, Interactive System Productivity Facility and REstructured eXtended eXecutor
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What is the use of learning REXX apart from it helps out to automate some of the tasks? Is there some real good use of this language in mainfames?
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Automation of many tasks at many levels.
Quickly write programs for investigating problems/producing one-off reports/tools.
99% (or more) of my programming at home is done using rexx.