mutation:/home/oracle/scr/ora >imp dbadmin file=dbadmin.dmp indexfile=script fromuser=dbadmin touser=dbadmin

Import: Release 9.2.0.1.0 - Production on Tue Aug 5 09:35:16 2003

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

Password:

Connected to: Oracle9i Enterprise Edition Release 9.2.0.1.0 - 64bit Production
With the Partitioning and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production

Export file created by EXPORT:V09.02.00 via conventional path
import done in US7ASCII character set and AL16UTF16 NCHAR character set
import server uses WE8ISO8859P1 character set (possible charset conversion)
. . skipping table "A"

. . skipping table "B"

. . skipping table "BONUS"

. . skipping table "DEPT"

. . skipping table "DUM_DEPT"

. . skipping table "E"

. . skipping table "EMP"

. . skipping table "H"

. . skipping table "I"

. . skipping table "PLAN_TABLE"

. . skipping table "REPOSITORY"

. . skipping table "S"

. . skipping table "SALGRADE"

. . skipping table "TEST"

. . skipping table "TEST11"

. . skipping table "TEST23"

Import terminated successfully without warnings.
mutation:/home/oracle/scr/ora >cat script.sql

REM  CREATE TABLE "DBADMIN"."A" ("D" NUMBER) PCTFREE 10 PCTUSED 40
REM  INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELIST
REM  GROUPS 1) TABLESPACE "USERS" LOGGING NOCOMPRESS ;
REM  ... 0 rows
REM  CREATE TABLE "DBADMIN"."B" ("ONE" NUMBER, "THREE" NUMBER) PCTFREE 10
REM  PCTUSED 40 INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1
REM  FREELIST GROUPS 1) TABLESPACE "USERS" LOGGING NOCOMPRESS ;
REM  ... 0 rows
REM  CREATE TABLE "DBADMIN"."BONUS" ("ENAME" VARCHAR2(10), "JOB"
REM  VARCHAR2(9), "SAL" NUMBER, "COMM" NUMBER) PCTFREE 10 PCTUSED 40
REM  INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 FREELISTS 1 FREELIST
REM  GROUPS 1) TABLESPACE "USERS" LOGGING NOCOMPRESS ;
REM  ... 0 rows
....
...
....
REM  ALTER TABLE "DBADMIN"."I" ADD FOREIGN KEY ("ID") REFERENCES "H"
REM  ("ID") DISABLE NOVALIDATE ;
mutation:/home/oracle/scr/ora >

just do an regular export.
to view the contents of the exported file or to generate the ddl of the tables use this INDEXFILE option. since we cannot OPEN OR view THE .DMP FILE
we can make use of this option.

imp indexfile=script creates an script.sql which will contain the ddl for the objects.