Attach a Sink to the output of this Process but echo the original.
Feed this Process through the given effectful Channel.
Feed this Process through the given effectful Channel, signaling
termination to f via None.
Feed this Process through the given effectful Channel, signaling
termination to f via None. Useful to allow f to flush any
buffered values to the output when it detects termination, see
scalaz.stream.io.bufferedChannel combinator.
Attaches Sink to this Process