Hi Ian ,is this right ..

[root@cu180 ~]# su oracle
[oracle@cu180 root]$ expdb
bash: expdb: command not found
[oracle@cu180 root]$ expdp

Export: Release 10.2.0.4.0 - Production on Wednesday, 09 June, 2010 14:19:23

Copyright (c) 2003, 2007, Oracle.  All rights reserved.

Username: sys@cu180 as sysdba
Password:

Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "SYS"."SYS_EXPORT_SCHEMA_01":  sys/********@cu180 AS SYSDBA
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA