>>> "If there are OpAmps in a design, terminate unused opamps
>>> in dual
>>> or quad packs by grounding the positive input to ground,
>>> then connecting
>>> the negative input to the output."
>
>> "Always assuming that the Opamps have input-to-ground
>> specification" (unlike
>> certain popular FET input opamps ...
>
>The writer of that advice MAY have been living in a dual
>rail only world where ground is always well away from the
>rails.

However to be fair, on a single rail system there is generally a bias point 
that gets regarded as "analogue ground", and that is effectively what is 
suggested for the connection, without it being implicitly said. 

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