JCL utilities are pre-written programs that are widely used by system programmers and application developers to meet day-to-day requirements, organize and maintain data. Reorganizing, MODIFYING, or COMPARING data at the record or data set level is done with them. Here are a few of them, along with their functionality: 

• IDCAMS: Although IDCAMS provides other functions, it is primarily used for defining and managing VSAM data sets and integrated CATALOG facilities catalogs.
• IEBCOPY: This program COPIES one or more members of an existing dataset onto a new or existing PDS dataset. It also compresses PDS, loads PDS to TAPE, and unloads from TAPE onto DISK.
• IEBGENER: Often used for copying or printing sequential data sets, it is also a tool for copying TAPE files to DISK and vice versa.
• IEBUPDTE: This utility can create new members within a partitioned data set, or update records within an existing member. This is mostly used to create or maintain assembler macro libraries and JCL procedure libraries.
• IEHMOVE: It is typically used to move datasets between volumes.