Write a script

Thanks to everybody for your help.
I have tried to use
R < myscript.R 
and it works.
I have also tried
R CMD BATCH myscript.R
but I get an error:
Error in png(filename = fichier) : the x11 device has not been loaded
that correspond with the command lines:
  file1_paste(Classification,"dendo.png",sep="")
  png(filename=file1)
  plot(tri1)
  dev.off()

I can't find where it comes from.
I would like to use BATCH because I have some parameters to give to my
script. Can someone also tell me how it has to be done?
Thanks for your help
Denis Choquet
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