This is Perl module Loop::Sustainable.

INSTALLATION

Loop::Sustainable installation is straightforward. If your CPAN shell is set up,
you should just be able to do

   % cpan Loop::Sustainable

Download it, unpack it, then build it as per the usual:

   % perl Makefile.PL
   % make && make test

Then install it:

   % make install

DOCUMENTATION

Loop::Sustainable documentation is available as in POD. So you can do:

   % perldoc Loop::Sustainable

to read the documentation online with your favorite pager.

Toru Yamaguchi