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{
  '/a/b/c/dt/data/SUSE/tool/0.9.0' => '/a/b/c/dt/tools/SUSE/tool/0.9.0
+',
  '/nfs/us/tools/SUSE12' => '/usr/bin',
  '/a/b/c' => '/p'
};

realpath /p # Yields /a/b/c

{
  '/a/b/c/dt/data/SUSE/tool/0.9.0' => '/p/dt/tools/SUSE/tool/0.9.0',
  '/nfs/us/tools/SUSE12' => '/usr/bin',
  '/a/b/c' => '/p'
};

foreach my $actual_path_to_check (keys(%{$virtual_paths_href})) {
    foreach my $current_actual_path (keys(%{$virtual_paths_href})) {
...
        }
    }
}