Neat problem! I like Corion's answer, but here is another way to try out. The idea is to split each entry on the slash to create an array. Then you eval that array into a hash data structure: 
use strict;
use Data::Dumper;
$Data::Dumper::Indent = 1;

my %thingy;
my @lines = ... # insert your data here

for (sort @lines) {
   my ($type,$stuff) = $_ =~ /([A-Z]):\s+(.*)/;
   my @parts = split('/',$stuff);
   push @parts,'';
   my $str = q|$thingy{'| . shift(@parts) . q|'}|;
   for my $part (@parts) {
      $str .= qq|->{'$part'}|;
   }
   eval $str;
}

print Dumper \%thingy;

[download]
This produces a data structure like so: 
$VAR1 = {
  'Location' => {},
  'Topology' => {
    'IPClassA' => {
      'Device' => {
        'log_ratio' => {},
        'poll_interval' => {}
      },
      'Device = 2' => {
        'Port' => {
          'ifPhysAddress' => {},
          'poll_interval' => {}
        },
        'is_managed' => {},
        'poll_interval' => {}
      }
    },
    'IPClassC' => {
      'Device' => {
        'poll_interval' => {}
      }
    }
  }
};
Now all you need is some code to turn the data structure back into a list of paths: 
my (@list,$flat);
flatten($_,$thingy{$_}) foreach keys %thingy;

sub flatten {
   my ($key,$rest) = @_;
   unless ($rest) {
      push @list,$flat;
      undef $flat;
      return;
   }
   $flat .= "$key/";
   flatten(%$rest);
}

print Dumper \@list;

[download]
But this does not work correctly: 
$VAR1 = [
  'Location/',
  'Topology/IPClassA/Device/log_ratio/'
];

[download]
Sorry, but i am at my wit's end on this one (Saturday morning laziness :D). At this point, my 'answer' turns into a question: 'How do you recursively "flatten" this data structure?'

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to (jeffa) Re: Unique Array Entries by jeffa
in thread Unique Array Entries by The_Rev

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