1. Explain COND parameter in JCL. What parameters can be coded both in JOB level as well as STEP level. What are GDG and how to access previous version, next version and current version in any given job.

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COND parameter in JCL, parameters in JOB and STEP level, accessing GDG versions in a job.

COND parameter is used to specify a condition code that must be satisfied for the job or step to execute.
Parameters like TIME, REGION, MSGCLASS, etc. can be coded in both JOB and STEP level.
GDG (Generation Data Group) is a group of datasets related to each other by a common name and a generation number.
To access previous version, use (-1), next version use (+1), and current version use (0) in the GDG base name.
Example: GDG.BASE(-1) will access the previous version of the GDG dataset named BASE.
Example: //STEP1 EXEC PGM=IEFBR14,COND=(0,NE) will execute STEP1 only if the previous step had a non-zero return code.

1. Explain COND parameter in JCL. What parameters can be coded both in JOB level as well as STEP level. What are GDG and how to access previous version, next version and current version in any given job.

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