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Job Step

Enhanced Definition

An individual program execution within a job, defined by an EXEC statement in JCL. A job can contain multiple steps that execute sequentially. A job step is a distinct unit of work within a z/OS batch job, defined by an `EXEC` statement in Job Control Language (JCL). Each job step is responsible for executing a specific program or utility, performing a particular function, and can include associated `DD` (Data Definition) statements to define its input and output datasets.

Key Characteristics

- Single program execution
- Defined by EXEC statement
- Sequential execution within job
- Independent return code
- Up to 255 steps per job
Step Components:
- Step Name: 1-8 character identifier
- Program or Procedure: What to execute
- DD Statements: Files and datasets
- Step Parameters: PARM, COND, TIME, REGION

Step Execution:

//STEP1    EXEC PGM=SORT
//STEP2    EXEC PGM=MYPROG,PARM='OPTION1'
//STEP3    EXEC PROC=COMPILE,COND=(0,NE,STEP2)

Conditional Execution:
- Based on previous step return codes
- COND parameter on EXEC statement
- IF/THEN/ELSE logic
- Bypass step execution
Step Return Codes:
- 0: Successful completion
- 4: Warning condition
- 8: Error condition
- 12: Severe error
- 16+: Critical failure

Use Cases

- Multi-step processing workflows
- Compile, link, and execute sequences
- Data transformation pipelines
- Conditional processing logic
- Error handling and recovery