Mainframe

Basic of REXX

REXX stands for REstructured eXtended eXecutor.  Rexx is basically used as a scripting and macro language it was developed  by Mike Cowlishaw in the year 1979, currently who is a visiting professor at the University of Warwick. REXX was first implemented in assembly language to replace the languages EXEC and EXEC-2. Rexx is a free-form language. Unlike COBOL, a Rexx program does not have a ...

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COBOL Structure and Divisions

Before start with programming let’s start with the structure of the COBOL program. How the COBOL program should be written. All COBOL program consists of the following hierarchical structure.   Division is a block of code usually contains one or more sections. It starts where the division name is encountered and it ends with the beginning of the next division ...

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What is COBOL and Why COBOL

COBOL (Common Business Oriented Language) was the first high-level programming language for business applications in mainframe.  The general idea behind COBOL was to produce a language that was English based as opposed to mathematically based or expressed as such in the code. Appearing in the early 1960’s it was massively adopted for processing in the area of business specially in ...

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What is JCL

JCL (Job control Language) is the controller language of Mainframe (Z/OS or MVS).  It has control statements that are being used a specific job for the operating system. It is bridge between application program and operating system. In a simplest way, JCL is a scripting language in mainframe which is being used to submit batch jobs in mainframe. Any program ...

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Job Card

Every JCL should be start with a JOBCARD. Job card is the controller of a JCL like identify the job and tell the MVS type and priority of the job , how the output will be or in notification to the user etc, A job card is look like below: //jobname JOB (ACCT INFO),’Label’, //            CLASS=class, MSGCLASS=output-class, //            MSGLEVEL=(stmt,msg),PRTY=15,TIME=1440 min, ...

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Introduction of Mainframe

Mainframe, the father of all computer, first time IBM  introduced this large high-speed computer in 1952, after that they produced better mainframe. They are continuing this task till today. In the late 1960, IBM manufactured several large computer models, known as the IBM 700/7000 series. Initially IBM  sold mainframe without any software, expecting customers to write their own. Programs were manually initiated, one ...

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