In IBM mainframe environment, A dataset consists of records and each record consists of fields. The layout of record is defined by a COPYBOOK which defines each field with field name, field type and field length.
The CopybookViewer will display the copybook in table format which consists of, besides field name/field type/field length, the start and offset of each field. Optionally CSV, Easytrieve or SAS format are displayed.
Get Copybook Viewer and give it a try to fully assess its capabilities!