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