I would attack this with a hash to filter out duplicates: 
while(<FH>){
 chomp;
 my @fields = split;
 my $ip = shift @fields;
 foreach ( @fields ){
  $masterhash{$ip}{$_} = 1;
 }
}

[download]
Now the hash will contain an unique IP as key with a hash as value of which the keys are uniqe aliases..
So now just print it out: 
for my $ip ( keys %masterhash ){
 print "$ip ", join (" ",keys %{$masterhash{$ip}}),"\n";
}

[download]
Hope this helps... (not tested)

Go Fish!

In reply to Re: Perl and arrays of arrays? by aukjan
in thread Perl and arrays of arrays? by Anonymous Monk

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