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