any unix/linux script to generate schema DDL?

Hi,

Oracle 10.2.0.1.0

Does anyone know any sites or URL that has unix/linux script(s) to generate a 
schema DDL (including tables, index, views, package code, store procs, etc), 
say using soemthing like DBMS_METADATA.GET_DDL? I can use Oracle SQLDeveloper 
to do it manually, but I would like to have the script called by a cron job. 
BTW, I do not want to use dump file to import the db structure, just some 
unix/linux script to "extract" schema DDL. I googled around but could not find 
one.

TIA.
Guang


      
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