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

my %services = (www => qr/:0050\s/,
                ssh => qr/:0016\s/,
                irc => qr/:1A0B\s/,
                ftp => qr/:0015\s/,
               );
my $date = `date +"%l:%M:%S"`;
my @tcpalive = grep /\b01\s/,`cat /proc/net/tcp`;

while (my($key,$REx) = each %services) {
    $services{$key} = grep /$REx/,@tcpalive
}

open (FILE, "+>/var/www/web/main.txt") or die $!;
print FILE "There are $services{www} web, $services{ftp} ftp, ",
           "$services{ssh} ssh, and $services{irc} irc connections ",
           "to this server as of $date\n";
close FILE or die $!;