This isn't tested, but I cleaned up your code and added a couple of things to do what I think you need:

#!/usr/bin/perl -w
use strict;

my $log = './log';

# Open the firewall log file and create new array containing all of th
+e data.

open LOG, "<", $log or die "Can't open $log: $!";
my @data = <LOG>;
close LOG;

# Split the @data array into separate arrays by category.

my (@dst, @service);
my $dup_count     = 0;
my $last_dst      = '';
my $last_service  = '';

foreach (@data) {
  my @lines=split "\n",$_;
   foreach(@lines){
    my ($dst,$service) = (split /;/,$_)[11,12];
    push(@dst, $dst);
    push(@service, $service);
    if ( $dst eq $last_dst and $service eq $last_service ) {
      $dup_count++;
      # you probably want to clean up dup_count here to avoid func
      # being called for dup 51, dup 52, etc
      &some_func if $dup_count >= 50;
    } else {
      # didn't match, so we reset;
      $dup_count    = 0;
    }
    $last_dst     = $dst;
    $last_service = $service;
  }
}

[download]

Cheers,
Ovid

Update: Okay, I think I am confused about the specification. I thought we were looking for 50 identical dsts and services in a row. Reading the question closer, it appears to be a has related issue, in which case, TomK32 gave a good answer.

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In reply to (Ovid) Re: Another Array Problem. by Ovid
in thread Another Array Problem: comparing. by dru145

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