my %fileinfo = (); # name -> (array-of-path+size+etc)
my $href = \%fileinfo;

my %dupes = (); # name->count
my $dref = \%dupes;

#------------------------

foreach # for each file, recursing through directory tree
{
   # here $_ is each file name
   if( exists %$href->{ $_ } )  # if filename seen already 
	{
       %$dref->{ $_ } = 1;	# then record in %dupes
 	}

	@filedata = ( $fpath, $fsize, $fdate ); # but using real data

	# this is where I'm lost -- don't know how to "savedata"
	@savedata = %$href->{ $_ }; # get data data saved for filename
	push @savedata, @filedata;  # add new data to saved data
 	%$href->{ $_ } = @savedata; # put new data back in the hash
}


##</code><code>##

  myfile.mp3
      c:\dir1\dir2;  date=12/3/45;  size=12345
      c:\dir3\dir4;  date=1/01/01;  size=54321

##</code><code>##

   @savedata = %$href->{ $_ };
   push @savedata, @filedata;
   %$href->{ $_ } = @savedata;