I've generally found it a bit tricky to get Net::Telnet working properly for particular machines. Something close to the following usually works for me (but seemingly inconsequential changes can cause failure):

use strict;
use Net::Telnet;
print "passwd: ";
my $passwd=<>;
chomp($passwd); #passwd not hard-coded in script
my $telnet = Net::Telnet->new(Host=>'linux63.blahblah.edu',Prompt=>'/l
+inux63> $
/');
$telnet->waitfor('/login/');
$telnet->print("myusername");
$telnet->waitfor('/Password/');
$telnet->print("$passwd\n");
$telnet->waitfor('/linux63/');
my @lines = $telnet->cmd("somecommand");
#etc
$telnet->print("logout\n");
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chas