Writing Text Files from PostgreSQL

Hello.  I am brand new to PostgreSQL and I need someone to point me in
the right direction on how to write the results of a function to a text
file.  Is it possible to do this within the PostgreSQL PL/pgSQL
language?  I have done this before in Oracle using the UTL_FILE commands
and I was hoping that PostgreSQL had similar functionality.  I need to
provide some data formatting in the text file that I produce so I don't
think the pg_dump command would work for me (correct me if I am wrong
though).  Thanks in advance for any help that you can give.

System Specs:
PostgreSQL 8.1 on Linux

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   William Gerber
   ERG
   5608 Parkcrest Drive, Suite 100
   Austin, TX 78731-4947
   ph: 512-407-1827
   fax: 512-419-0089
   e-mail: william.gerber@erg.com
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