Hello guys, I have two files: File A 
02,29031990,feb,21,5
02,29031990,feb,18,5
02,29031990,feb,20,5
02,29031990,feb,21,5

[download]
File B 
Unit4872,29031990,01,0
Unit4873,29031990,03,0
Unit4874,29031990,02,4
Unit4875,29031990,02,3
Unit4876,29031990,02,2
Unit4877,29031990,02,1
Unit4878,29031990,02,0

[download]
My keys I have matched are 1st with 2nd column from File A and 2nd with 3rd from file B. My rule is when both keys matched I will print 1st column from File B with 2nd, 1st, 3rd, 4th and 5th from File A and one counter of all rows of the File A. So, with combined these two files I have created this file: 
Unit4874,29031990,02,feb,21,5,1
Unit4875,29031990,02,feb,18,5,2
Unit4876,29031990,02,feb,20,5,3
Unit4877,29031990,02,feb,21,5,4

[download]
Now my situation is this. If my last number of my counter(in this case is 4) minus the 5th column from File A is 1, I have to get next line from File B adding add 1 more to counter and getting the last result of 4th column from File B. My result would be like that. 
Unit4874,29031990,02,feb,21,5,1
Unit4875,29031990,02,feb,18,5,2
Unit4876,29031990,02,feb,20,5,3
Unit4877,29031990,02,feb,21,5,4
Unit4878,29031990,02,feb,21,5,5.

[download]
This is my code so far. I was testing but I am caught in this code. 
#!/usr/bin/perl

use strict;
use warnings;
use Data::Dumper qw(Dumper);


my $filea = $ARGV[0];

my $fileb = $ARGV[1];

open ( FA, '<', $filea) || die ( "File $filea Not Found!" );
open ( FB, '<', $fileb) || die ( "File $fileb Not Found!" );

my %ts;
my @LAST_PLC;


while ( <FB> ) {
    chomp;
    my($Unit, $date, $mnt, $qtde) = split ",";
    push @{ $ts{$date,$mnt} }, $Unit;
    push @LAST_PLC, ($Unit);
}
        my $last_one = pop @LAST_PLC;
        #print $last_one."\n";
my $count=1;
my @FIRST_PRICE;
my $result;
my @FINAL;
my $price;
while ( <FA> ) {
    chomp;
    my($mnt,$date,$att,$idx,$max) = split ",";
    push @FIRST_PRICE, ($idx);
    $price = shift @FIRST_PRICE;

        #if ( exists( $ts{$date,$mnt} ) ){
                my $Unit = shift @{$ts{$date,$mnt}};
                if ( ( $max - $count ) eq 1 ) {
                        #print join(",", $last_one, $date, $mnt, $att,
+ $idx, $max, $count)."\n";
                #} else {
                        print join(",", $Unit, $date, $mnt, $att, $idx
+, $max, $count)."\n";
                }
                #push @FINAL, (join(",", $Unit, $date, $mnt, $att, $id
+x, $max, $count, $last_one)."\n");
                $count++;
        #}
}
        #print @FINAL;

[download]

In reply to Controlling the count in array by EBK

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