Recursively Replace Spaces with Underscores and Make All Characters Lowercase

Recursively Replace Spaces with Underscores and Make All Characters Lowercase

find . -depth | while IFS= read -r file; do
    new="$(dirname "$file")/$(basename "$file" | tr '[:upper:]' '[:lower:]' | tr ' ' '_')"
    if [ "$file" != "$new" ]; then
        echo "Renaming: $file -> $new"
        mv "$file" "$new"
    fi
done