You can open a pipe to that process: 
open my $x, "|-", "R" or die "Can't launch R: $!";
pritn $x $your_data;

[download]

If you also need to capture STDOUT, IPC::Open2 or IPC::Open3 might what you want.

In reply to Re: launch a program and then write to the program by moritz
in thread launch a program and then write to the program by aardvarc

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