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aplay(1) -M
command-line sound recorder and player for ALSA soundcard driver
-M, --mmap
       Use memory-mapped (mmap) I/O mode for the audio stream.  If this option is not set, the read/write
       I/O mode will be used.

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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