ibm-zos-jcl-exercises

Hands-on IBM z/OS JCL exercises covering dataset management, IEBGENER utility, COBOL job execution, and JES job debugging.

📌 Overview

This project demonstrates hands-on experience with IBM z/OS Job Control Language (JCL), including dataset management, utility execution, COBOL integration, and job debugging using JES logs.

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🛠️ Technologies

• IBM z/OS
• JCL (Job Control Language)
• IEBGENER Utility
• COBOL (compile & run)
• JES2 Job Management

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🔄 Workflow

1. Copy Jobs Using IEBGENER (JCL1)

• Copied JCL members into personal dataset

• Learned strict DD requirements:

  • SYSUT1 (input)
  • SYSUT2 (output)
  • SYSIN (control)
  • SYSPRINT (messages)

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2. Compile and Run COBOL (JCL2)

• Compiled COBOL program using IGYWCL

• Fixed runtime error caused by DD mismatch:

  COMBINE → COMBINED
  

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3. Build Output Dataset (JCL3)

• Created dataset using multiple steps

• Used:

  • DISP=NEW (create)
  • DISP=MOD (append)
  • DISP=CATLG (save)

• Ensured:

  • No duplicate records
  • Correct ordering
  • Exact formatting

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📸 Screenshots

🔹 JCL3 Job (IEBGENER Steps)

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🔹 Final Output Dataset

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🔹 Validation Result (CC=0000)

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🐞 Errors Encountered & Fixes

Error	Cause	Fix
ABEND S013	Dataset issue	Correct DSN / DISP
CC=0012	Missing DD	Add required DD statements
IEC130I	SYSUT1 missing	Correct DD name
U4038	COBOL/JCL mismatch	Match DD name exactly
Duplicate dataset	Dataset already exists	Delete before rerun

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🧠 Key Takeaways

• DD names must match program expectations exactly
• DISP controls dataset lifecycle
• JES logs are critical for debugging
• Small syntax errors can cause job failure

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✅ Final Result

All jobs executed successfully:

CC = 0000

Validated using:

CHKJCL1

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🚀 Next Steps

• Add SORT utility examples
• Explore JCL PROCs
• Build multi-job workflows