Input syntax:
-export <tablespace(s)/table>Exports the specified objects. A list or a LIKE value can be defined for tablespaces; a table must always be specified singly by its name. If there are no further specifications, the export is made to the null device
/dev/null . This procedure is important for testing tables and indexes for corrupted Oracle blocks. No export dump file is generated.You can, however, run a normal export by specifying a target for the export dump file (directory or tape device, specification of tape size, if required). Only the regular SAPDBA export scripts and logs are generated.
Exporting and Importing Database Objects SAPDBA: Export/import