how to run .r batch file

You don't get Rcmd installed unless you check the "Source package
installation files" option when running SetupR.

The "Introduction to R" manual explains the 3 ways to run R in
Windows.  Rgui is the windowed version, Rterm is the command line
version, and Rcmd is a wrapper that calls Rterm.  I'd suggest that you
just use Rterm:

  Rterm --vanilla <myfile.R >myfile.out

will do what you want.  

Duncan Murdoch
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