End of Job is identified by NULL statement.

COMMENT FIELD Comment field optionally follows OPERAND FIELD, preceded by at least one blank. To continue the current line, end the current line before column 72 with, and start the next line anywhere between columns 4-16. If the OPERANDS are more, then they can be continued in the next line.

A comma separates parameters and there should not any space between parameters. OPERANDS follow OPERATION and there should be at least one space between them. OPERANDS are the parameters for the operation. Typical OPERATION keywords are JOB, EXEC and DD. If NAME is not coded then OPERATION can start at fourth column itself. There should be at least one space between NAME and OPERATION. Remaining characters can be any alphanumeric or national characters. The first character should be an alphabet or national character # or $). If coded, it should start at column3 and can have maximum 8 characters. STAR (*) in the third column, indicates that the line is a comment line. JCL statements should have // in column 1 and 2. CONTROL involves controlling the execution or bypassing of a program in the sequence based on the result of the prior program execution. Definition involves definition of the programs need to be executed, the data for the programs and the sequence of programs. JCL (Job Control Language) is used to DEFINE and CONTROL the JOB to the operating system. These programs should be executed in a pre-defined sequence to achieve the business functionality. Mainframe Refresher Part-1 JCL (Job Control Language)Īny business application is divided into logical modules and these modules are developed using programming languages.

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