use strict;
use Net::Telnet::Cisco;
open my $log, '>', 'logfile' or die "Cannnot open log file : $!\n";
open my $seed, '<', 'seedfile' or die "Cannot open seed file : $!\n";

while(<$seed>) {
    chomp;
    my $Telnet = Net::Telnet::Cisco->new(Host => $_) or die "Cannot op
+en session to '$seed': $!\n";
    $Telnet->login(Name => 'user', Password => 'pass') or die "Cannot 
+log into device '$_': $!\n";
    print $log "$_\n", map $Telnet->cmd($_), 'show line aux 0';    
}
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I'm basically fishing in the dark here, but maybe the following will work. Note how it's not passing a literal constant to ->cmd() anymore, it passes the (modifiable) elements of an array. It's the only spot I can think of; if that's not it, you probably have to contact the module author.

use strict;
use Net::Telnet::Cisco;

open my $log, '>', 'logfile'
    or die "Cannnot open log file : $!\n";
open my $seed, '<', 'seedfile'
    or die "Cannot open seed file : $!\n";

my @commands =('show line aux 0');

while(<$seed>) {
    chomp;
    my $Telnet = Net::Telnet::Cisco->new(Host => $_)
        or die "Cannot open session to '$_': $!\n";
    $Telnet->login(Name => 'user', Password => 'pass')
        or die "Cannot log into device '$_': $!\n";
    print $log "$_\n", $Telnet->cmd($_), @commands;    
}
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Makeshifts last the longest.

Thanks that was it. You truly are the man, the myth and the legend! Here is the final version i think:

#Use the Net Telnet Cisco module to getting into routers
#Written by Richmon Schumann 2-19-03
#Version 1.2
#Module Declarations
###########################################################
use strict;
use Net::Telnet::Cisco;
###########################################################
#The script will initialize my files
#This opens my log file for output
#
open my $log, '>', 'logfile' or die "Cannnot open log file : $!\n";
#
#This opens my seed file and stores it into an array
#
open my $seed, '<', 'seedfile' or die "Cannot open file : $!\n";
#This stores the contents of the seed file into an array
my @commands = ('show line aux 0');
############################################################
#MAIN SCRIPT
#This does the telnet into the routers and logs the output to the logf
+ile
#
while(<$seed>) {
    chomp;
    my $Telnet = Net::Telnet::Cisco->new(Host => $_) or die "Cannot op
+en session to '$seed': $!\n";
    $Telnet->login(Name => 'user', Password => 'pass') or die "Cannot 
+log into device '$_': $!\n";
    print $log "$_\n", grep (/Modem hardware state:/, map $Telnet->cmd
+($_), @commands);    
}
############################################################
#Cleanup
close $log;
close $seed;
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