Arecord

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For recording sound in Linux use arecord command. Example invocation is:

   arecord -f cd -t wav --max-file-time 3600 --use-strftime %Y/%m/%d/listen-%H-%M-%v.wav

For automatic non-stop record enable automatic login for a user. Then through terminal or remote ssh of that user (and not root or other user), run arecord in background for unlimited non-stop recording.

Refer https://www.freedesktop.org/wiki/Software/PulseAudio/FAQ/ and arecord man page for more details

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