IO::Pager is lightweight and can be used to locate an available pager and set
$ENV{PAGER} sanely or as a factory for creating objects defined elsewhere such
as IO::Pager::Buffered and IO::Pager::Unbuffered.

IO::Pager subclasses are designed to programmatically decide whether or not to
pipe a filehandle's output to a program specified in $ENV{PAGER}. Subclasses are
only required to support filehandle output methods and close, namely

WWW: http://search.cpan.org/dist/IO-Pager/