How important is it to install the optional Perl modules?
Some of Shepherd’s grabbers require additional Perl modules to be installed, without which they won’t function. They are listed as “optional” because Shepherd does not rely on any individual grabber to do its job; instead it draws on as many or as few of its available grabbers as necessary to acquire guide data for the time period and channels you want. Sometimes Shepherd can do this with a single grabber. More commonly, it employees multiple grabbers and combines their results. Generally speaking, Shepherd can perform very well even if some of its grabbers are disabled or unsupported (i.e. missing modules). However, it will probably perform more efficiently, reliably, and possibly more accurately if you can enable all of its grabbers.
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