my $log_csv = "/log/csv.csv";
open (my $pipe, "-|", "tail", "-n0", "-F", $log_csv) or die "error";
while (<$pipe>) {
    $line = $_ ;
    my $pid = fork();
    if (defined $pid && $pid == 0) {
        exec("/bin/prgPROCESS ".$line) ; # I tried system() too.
        exit 0;
    }
}