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aplay(1) -N
command-line sound recorder and player for ALSA soundcard driver
-N, --nonblock
       Open  the  audio  device  in  non-blocking  mode.  If  the  device  is  busy the program will exit
       immediately.  If this option is not set the program will block until the audio device is available
       again.

Examples

aplay -c 1 -t raw -r 22050 -f mu_law foobar will play the raw file "foobar" as a 22050-Hz, mono, 8-bit, Mu-Law .au file.
arecord -d 10 -f cd -t wav -D copy foobar.wav will record foobar.wav as a 10-second, CD-quality wave file, using the PCM "copy" (which might be defined in the user's .asoundrc file as: pcm.copy { type plug slave { pcm hw } route_policy copy }
arecord -t wav -max-file_time 30 mon.wav Record from the default audio source in monaural, 8,000 samples per second, 8 bits per sample. Start a new file every 30 seconds. File names are mon-nn.wav, where nn increases from 01. The file after mon-99.wav is mon-100.wav.
arecord -f cd -t wav -max-file-time 3600 --use-strftime %Y/%m/%d/listen-%H-%M-%v.wav Record in stereo from the default audio source. Create a new file every hour. The files are placed in directories based on their start dates and have names which include their start times and file numbers.

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