strip non alpha numeric for multiple filenames.

strip_file.sh

#!/bin/sh
for old in *.mp3; do
    new=$(echo $old | sed -e 's/[^a-zA-Z0-9\s\.]/_/g' | sed -e 's/_\+/_/g' | sed -e 's/_\./\./g')
    mv -v "$old" "$new"
done

# Modified from: 
# http://stackoverflow.com/questions/1961255/rename-files-using-a-regex-with-bash