fix spaces and capitalization in filenames

spaces to underscore:

find . -name "* *" -type d | rename -v -f 's/ /_/g'

find . -name "* *" -type f | rename -v -f 's/ /_/g'

change all to lowercase:

find . -depth -exec rename -v -f 's/(.*)\/([^\/]*)/$1\/\L$2/' {} \;

fix “-_” examples:

find . -name "*-_*" -type f | rename -v -f 's/-_/_/g'