For fixed length records, the fields in the data file must be of fixed length. The length of the record must be the same for all records and is specified in the commands file. In case of fixed length records, the field and record delimiters are ignored. That is, the POSITION specification must be such that the delimiters are ignored. For more information on the commands file refer to "The Commands File".
The data files that contain fixed length records can either be ASCII or binary files.