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git gc should be run on all git repositories every 100 commits. This will help do do so if you have many git repositories ;-)
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
A short variant if you have only one directory whit only audio files in it.
Maybe you want first check which files will be deleted:
find $HOME -name '*.sol' -exec echo rm {} \;
Standard command, but I always have to search for it... ;-)