Reconstruct CREATE <objtype> Statements from existing DB

[Quoted] I have a Oracle 8i (8.1.6) Database running on Linux since nearly 2 years. During that time the database layout was modified very often (all column, delete column, add a lot of tables, add/mod/delete views|triggers|constraints,...)

Now I have a small set of initial CREATE stmts and countless ALTER ... and CREATE ... statements for the modifications.

Q:
Is there a way to reconstruct a set of CREATE <objecttype> statements from this existing database?
(For views and triggers this is quite easy, but for tables and constraints??) (A free Tool working on Unix is preferred)

TIA
        wolfgang

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Wolfgang Fiedler  http://fiedler.vc-graz.ac.at   fiedler_at_sbox.tugraz.at
Student of Telematics at Graz University of Technology, Austria, Europe