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my @b = grep EXPR, @a;

my @b;
foreach (@a) {
...
      push @b, $_;
   }
}

my @uniqueIPs;
foreach (@uniqueIPs) {
...
      push @ipAddresses, $_;
   }
}

$x++

my $orig_x = $x;
++$x;
$orig_x

my @uniqueIPs;
foreach (@uniqueIPs) {
...
      push @ipAddresses, $_;  #    save it
   }
}

my %counts;
my @uniqueIPs = grep !$counts{$_}++, @ipAddresses;

my @uniqueIPs;
foreach (@uniqueIPs) {
...
      push @ipAddresses, $_;  #    save it
   }
}

# Remove duplicates IP addresses by counting
# the number of times each address occurs.
my %counts;
my @uniqueIPs = grep !$counts{$_}++, @ipAddresses;

# Remove duplicates IP addresses by counting
# the number of times each address occurs.
my %counts;
my @uniqueIPs = grep ++$counts{$_} == 1, @ipAddresses;