Explained: JCL

You want to run a COBOL program on a mainframe. You know which program to run. You know which files it needs to read. You know where you want the output to go. But the operating system does not know any of this until you tell it explicitly, in a specific language, before execution begins. That language is JCL : Job Control Language. It is the script you write to tell z/OS what to run, what data to use, where to put the results, and what to do if s… Read More