Richard,

why do you want to redirect the output? Your script can write directly
to a file. You should, however, make use of the OS's file lock mechanism
(if there is any) to prevent two instances of your script (which may be
started by a web user?) from concurrent access to the file.

Cheers

Stephan
-- 
Dipl.-Chem. Stephan Tinnemeyer
Lindenallee 20
24105 Kiel
Germany

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