use IO::Socket;

my $server = IO::Socket::INET->new(
    Listen => 5,
    LocalAddr => 'localhost',
    LocalPort => 5050,
    Proto     => 'tcp'
) or die "Can't create server socket: $!";

my $client = $server->accept;

open FILE, ">out" or die "Can't open: $!";
while (<$client>) {
    print FILE $_;
}
close FILE;