To record sound using linux/ubuntu we don't need and special softwares, a simple command line tool is available called arecord. One of the simple way to use the command in the terminal as follows.
The recording is continued as long as Cntrl+C is not pressed, recording infinitely. The recording will get saved in the file named filename.wav
If the recording needs to be stopped after a specific interval we can use the option -d
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