Bitmap & Batch mode

Hi,
I had tried to print plot via postsript in Batch mode (under UNIX) but owing
to the help list I found out that was not the right thing to do. However
with bitmap() it still doesn't work. I running R in batch mode from a perl
script.I don't get any error and get my results but I can't find my plot
(mydata.png).
Is there a particular tmp directory where it might go ?
Do I have to reconfigure a specific R file with path for bitmap ?

Nolwenn

********************************************
Nolwenn Le Meur
INSERM U533
Facult? de m?decine
1, rue Gaston Veil
44035 Nantes Cedex 1
France

Tel: (+33)-2-40-41-29-86 (office)
     (+33)-2-40-41-28-44 (secretary)
Fax: (+33)-2-40-41-29-50
mail: nolwenn.lemeur at nantes.inserm.fr
********************************************