Question:  I want to take an export dmp file and convert it into the native SQL statements.  Can I convert a dmp file using the sqlfile option?

Answer:  You cannot convert an existing dmp file because of its internal format, but you can re-run the impdp to get the SQL DDL statements from a Data Pump dmp file with this sqlfile command:

impdp scott/tiger directory=dir_name dumpfile=myfile sqlfile=xyz.sql

This sqlfile option will create a myfile file in the dir_name directory with the DDL statements.

Here is an example of using the sqlfile parameter with impdp to display the DDL within an Data Pump Export (expdp) file named myexp.dmp:

$ impdp directory=expdir dumpfile=myexp.dmp sqlfile=ddl.sql

Also see how using the sqlfile parameter is useful when gathering arguments for the dbms_datapump metadata_remap procedure.