Store Related Values Together

Parallel Arrays tend to create related problems later on
Suppose you want to print out user, group, and time, sorted by size?
This can be done, but it's tricky:

     @indices = sort { $size[$b] <=> $size[$a] } (0 .. $#size);
     for (@indices) {
       printf "%8s%8s %12d %8d\n",  $user[$_], $group[$_], 
                                    $time[$_], $size[$_];
     }