#!/usr/bin/env perl

use strict;
use warnings;

open(my $tmp, '>','result_3.csv') or die $!;

open(my $fh, '<', 'result_2.csv') or die $!;

@ARGV = ("result_2.csv");

while(<>){
    print $tmp "$_"  if 2 .. eof();
}

my $i = 0;
my $n = 0;    
my $fh_out;

open($fh_out, '>', "output-$n.csv") or die $!;

open($tmp, '<', "result_3.csv") or die $!;
while (my $line = <$tmp>) {
    print $fh_out $line;
    if ($. % 10 == 0) {
        close $fh_out;
        
        $n++;   
                $i++;
        open($fh_out, '>', "output-$n.csv") or die $!;
                print $fh_out "page $i\n";
    }
         
}