What is the difference between IEBGENER, IEBCOPY

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What is the difference between IEBGENER, IEBCOPY and REPRO in IDCAMS utility?

IEBGENER - This is a dataset utility for copying sequential dataset which produces a PDS or a member from a sequential dataset.
IEBCOPY - This is a dataset utility for copying one PDS to another or to merge PDSs.
REPRO - This is for copying sequential datasets. More or less same as the IEBGENER.

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