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Jcl quick guide JCL - QUICK GUIDE http www tutorialspoint com jcl jclquickguide htm JCL - OVERVIEW Copyright ? tutorialspoint com When to use JCL JCL is used in a mainframe environment to act as a communication between a program Example COBOL AssemblerorP

JCL - QUICK GUIDE http www tutorialspoint com jcl jclquickguide htm JCL - OVERVIEW Copyright ? tutorialspoint com When to use JCL JCL is used in a mainframe environment to act as a communication between a program Example COBOL AssemblerorPL I and the operating system In a mainframe environment programs can be executed in batch and online mode Example of a batch system can be processing the bank transactions through a VSAM VirtualStorageAccessMethod ?le and applying it to the corresponding accounts Example of an online system can be a back o ?ce screen used by sta ?s in a bank to open an account In batch mode programs are submitted to the operating system as a job through a JCL Batch and Online processing di ?er in the aspect of input output and program execution request In batch processing these aspects are fed into a JCL which is in turn received by the Operating System Job Processing A job is a unit of work which can be made up of many job steps Each job step is speci ?ed in a Job Control Language JCL through a set of Job Control Statements The Operating System uses Job Entry System JES to receive jobs into the Operating System to schedule them for processing and to control the output Job processing goes through a series of steps as given below Job Submission - Submitting the JCL to JES Job Conversion - The JCL along with the PROC is converted into an interpreted text to be understood by JES and stored into a dataset which we call as SPOOL Job Queuing - JES decides the priority of the job based on CLASS and PRTY parameters in the JOB statement explained in JCL - JOB Statement chapter The JCL errors are checked and the job is scheduled into the job queue if there are no errors Job Execution - When the job reaches its highest priority it is taken up for execution from the job queue The JCL is read from the SPOOL the program is executed and the output is redirected to the corresponding output destination as speci ?ed in the JCL Purging - When the job is complete the allocated resources and the JES SPOOL space is released In order to store the job log we need to copy the job log to another dataset before it is released from the SPOOL CJCL - ENVIRONMENT SETUP Installing JCL on Windows Linux There are many Free Mainframe Emulators available for Windows which can be used to write and learn sample JCLs One such emulator is Hercules which can be easily installed in Windows by following few simple steps given below Download and install the Hercules emulator which is available from the Hercules' home site - www hercules- eu Once you installed package on Windows machine it will create a folder like C Mainframes Run Command Prompt CMD and reach the directory C Mainframes on CMD The complete guide on various commands to write