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my %log_file_hash = ();
my @log_file_array;
...
#now the whole file is in the hash and array.
print "The first line is " . $log_file_hash{"0"} . "\n";
print "From the array... " . $log_file_array[0] . "\n";

$line_0 = "";
$line_1 = "";
...
  $line_0 = $line;
}