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I am looking for command-line utility that monitors the microphone, and if you start to speak, writes the file. Recording period should be adjusted.

Solution is:

   sox -t alsa default recording.wav silence 1 0.1 5% 1 1.0 5%
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From http://dabase.com/u/record_wav/

arecord -vv -fdat stackoverflow.wav
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    this command writes output file constantly with silence. Тhis is not something that I need – kirill Feb 1 '12 at 7:16
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    Does your Mic work with Skype testing? Is it enabled via alsamixer? – hendry Feb 1 '12 at 7:24
  • Yes Mic working with skype, enabled – kirill Feb 1 '12 at 11:12
  • I tried it and it is working > arecord -vv -fdat stackoverflow.wav I think the problem is that you are not selecting microphone in the settings, you have analog input instead change that and it should work – Robin Apr 7 '15 at 20:01
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    @hendry: Did you even read the question. The asker wants something that only triggers when a sound is heard, and then records for a specific period of time. – Bjarke Freund-Hansen Mar 29 '17 at 8:02

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