You'll need to fork the R script yourself like this:
my $pid;
defined($pid = fork()) or die "unable to fork: $!\n";
if ($pid == 0) { # child
exec(...); # exec R script here
die "unable to exec: $!\n";
}
# parent continues here
Note that depending on how you call exec, $pid will either be the pid of the R command or the pid of a shell that perl creates to invoke the R command. Examples:
exec("R", "and", "some", "args"); # $pid will be the R command
exec("R and some args > out"); # $pid will be that of a shell
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