drmatt wrote: 
> Ok, it seems cp is too dumb to not write.
I don't see how there's anything dumb about this. The whole point of
Unix is that it's built from lots of uncomplicated components (that you
might like to classify as "dumb"), and it's the way you combine them
that results in "clever" outcomes.

cp has no knowledge of what /dev/null is. As far as cp is concerned,
it's copying a file there, and it's the operating system's device
handler that knows /dev/null is special and to just chuck away all data
piped to it. Imagine how tiresome it would be for application developers
if every program had to independently recognise the special case of its
output being sent to /dev/null.



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