please help me...

Dear Netters:

    When I use sqlplus, I find everything is duplicated.     For example, when I type:
    SQL>help,
every line comes out has a duplication right below it.

    When I type:
    SQL>select * from tablename
the table will double its size because each record is duplicated.

    It brings much trouble to me. Could you tell me how to fix this problem?

    Thanks a lot!

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