[linux-audio-user] low fidelity, long duration recording

Hi, I'd like to record about 6-8 hours of one channel, very low
fidelity sound. I'll be recording silence, punctuated by sound.
It'd be even better if rather than recording that much silence, that
the recorder would only record to hard drive when there was sound
present. What recording software would be good for either task?

Thanks!

--
Kevin