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The CTDUFUPD utility is primarily used to update History, Migration, Active, or Permanent User files. Selection parameters are used as criteria for selecting records to be changed. Change parameters specify the fields to be updated and the values for those fields.
This utility can also be used to print and/or delete User file records that meet the selection criteria.
The utility receives SELECT control statements followed by either CHANGE TO statements or a DELETE statement.
The utility scans the files that are specified using FILE parameters, selects the records that match the selection criteria, and either modifies those records according to the parameters specified after the CHANGE TO statement, or deletes the selected records if a DELETE statement is present.
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