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If B reads standard input you'll need to use a different file descriptor.
– l0b0
Commented Jun 25, 2013 at 10:41
Why are you backgrounding B?
– l0b0
Commented Jun 25, 2013 at 10:42
@l0b0 backgrounding is how I would address the "line being processed as input for B separately and instantly" requirement.
– Adam Siemion
Commented Jun 25, 2013 at 10:46
"Instantly" is not the same as "asynchrously". This solution will end up shuffling lines with B's execution time.
– l0b0
Commented Jun 25, 2013 at 10:50
interestingly this does not make it faster. I actually have sed as the B-command. A simple example like ls -l && sleep 3 | sed 's/.*/&/' | while read l; do echo $l; done does work though.
– wuschelhase
Commented Jun 25, 2013 at 11:04

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```
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