My program requirs to read an input file with 3 columns(month dates, fileSize, fileName)in 3 steps: Here I only sample 2 months dates in Julian year order to give an example.

1. count the total number of files loaded in each month.
2. count the total file size for each month.
3. count the largest file size in each month.

I do need help to correct my code; when I run it, it doesn't go to output file, and the output is not in individual month but in whole months. Much appreciated if anyone could improve my code to approach the solution.

Here is my input file format.

001 175 FILENAME
002 1856 FILENAME
003 177 FILENAME
032 175 FILENAME
033 2345 FILENAME
034 175 FILENAME

Here is my code:

#!/usr/bin/perl
     use strict;
use warning;
use Data::Dumper;
use File::Find;
use File::stat;
use sort 'stable';

my $filin = '/root/scripts/newsort.in';
my $fleot = '/root/scripts/results/size.out';

open my $fh, $filin || die $!;
open my $fot, ">$fleot" || die $!;


##Define month lengths
@Janlen = ( '006', '007', '008', '009', '010', '011', '012', '013', '0
+14', '015', '016', '017', '018', '019', '020', '021', '022', '023', '
+024', '025', '026', '027', '028', '029', '030', '031' );
@Feblen = ( '032', '033', '034', '035', '036', '037', '038', '039', '0
+40', '041', '042', '043', '044', '045', '046', '047', '048', '049', '
+050', '051', '052', '053', '054', '055', '056', '057', '058', '059' )
+;
#Define month hash
%mthlens = (@Janlen, @Feblen);
my @julens = %mthlens;
my $julias = @julens;
my $Janlias = @Janlen;
my $Feblias = @Feblen;
my $Marlias = @Marlen;

while (%mthlens=<$fh>){
chomp;

my %lengths = map { $_ => length $_ } %mthlens;
while ( my ($Janlen,$length,$filename) = each 
%lengths) { 
     @s = sort { $length{$b} <=> $length{$a}} keys 
 %length;
     print join("\t", $Janlen,  $length, $filename 
), "\n";
   } 
}
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