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Prepends all directory items with "prependtext"
all files in the directory get moved, in doing so the new name of the file is the original name with out spaces (using translate command)
This heavy one liner gets all the files in the "/music/dir/" directory and filters for non 44.1 mp3 files. After doing this it passes the names to sox in-order to re-sample those files. The original files are left just in case.