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Q: What causes file status 48?
Answer:
Status 48 is OPEN failure, file already open. Check logic - may have duplicate OPEN. CLOSE before re-OPEN. COBOL FILE-STATUS check important. May be another job has exclusive access.
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Q: What is FILE STATUS and common codes?
Answer:
FILE STATUS is a 2-byte field capturing I/O operation results. 00=success, 10=end-of-file, 22=duplicate key, 23=record not found, 35=file not found, 39=file attribute mismatch, 41=file already open, 47=not opened input. Essential for error handling.