#!/usr/local/bin/perl -w

use strict;
use IO::Socket;

my $Usage="$0 -start [Start port] -end [End port] -address [IP address
+]";

die "Usage: $Usage \n" if ((@ARGV==0)||((scalar @ARGV)%2!=0));

my %CommandLine=@ARGV;

my $Start=$CommandLine{-start}     || 1;
my $End=$CommandLine{-end}         || 1024;
my $Address=$CommandLine{-address} || "127.0.0.1";

print "Scanning $Address: ports $Start\-$End\n";

local $^W=0;
for (my $Port=$Start;$Port<=$End;$Port++) 
{
 print "Port $Port (",getservbyport($1,"tcp")||"Unknown",") is open\n"
+ if IO::Socket::INET->new("$Address:$Port");
};
$^W++;
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