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This command extracts the audio stream of the video in $file and stores it in a file where the original suffix is changed to .mp3
There are 2 alternatives - vote for the best!
This commands saves the output in the audio directory. The portion ${file/%avi/mp3} uses bash string replacement to replace the avi to mp3 within the ${file} variable.
If you can do better, submit your command here.
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