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some_source | (tee /dev/stderr | sink_1) 2>&1 | sink_2

Seems to fail.

How to do it right without of any temporaries?

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In what way is it failing. I get the same result for your example, grawity's answer and for some_source | { tee /dev/stderr | sink_1; } 2>&1 | sink_2 – Dennis Williamson Mar 15 '11 at 19:56
up vote 4 down vote accepted
some_source | tee >(sink_1) | sink_2

>( ) is process substitution.

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