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  1. or download this
    $ rename
Usage: rename [-v] perlexpr [filenames]
  2. or download this
    $ rename -v '$_=lc;s/[^\w.]+/_/g' *
The Pogues - Beer, Beer, Beer (Irish drinking song).mp3 renamed as the
+_pogues_beer_beer_beer_irish_drinking_song_.mp3