You might want to look into socket programming in Perl; it's not really that terribly difficult to get started, and there are some good examples around the Monastary. Here is a short example of networking with IO::Socket.
use strict;
use IO::Socket;
my $host = 'pdp11.mydomain.net';
my $port = 6740;
my $socket = new IO::Socket::INET(PeerAddr => $host,
PeerPort => $port,
Proto => 'tcp');
die "cannot open socket" unless ($socket);
#send a custom command to the PDP-11 server
my $cmd = "GIMME\n";
print $socket $cmd;
# print the server's response to the gimme request
while (<$socket>) {
print;
}
close $socket;
The reason I suggest this type of approach is that using netcat is going to limit portability for your code, if you decide to try and run it on a platform that doesn't have netcat for instance.
Also, using spawned external child processes will likely lead to more issues such as the one you're having. It's probably a better idea to use the functionality that's already built in to Perl.
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