This is Perl module File::Spec::Memoized. INSTALLATION File::Spec::Memoized installation is straightforward. If your CPAN shell is set up, you should just be able to do $ cpan File::Spec::Memoized Download it, unpack it, then build it as per the usual: $ perl Makefile.PL $ make && make test Then install it: $ make install DOCUMENTATION File::Spec::Memoized documentation is available as in POD. So you can do: $ perldoc File::Spec::Memoized to read the documentation online with your favorite pager. Goro Fuji (gfx)