rename_folders_to-.sh

#!/usr/bin/env bash

# Rename all directories (not files) in the current directory to lowercase, Replace underscores and spaces with hyphens

# Find all directories in the current directory and rename them
find . -maxdepth 1 -mindepth 1 -type d | while read -r d; do
  # strip leading ./ and trailing /
  d=$(basename "$d")
  d2=$(echo "$d" | tr '[:upper:]' '[:lower:]' | tr ' ' '-' | tr '_' '-')
  if [ "$d" != "$d2" ]; then
    echo "Renaming $d to $d2"
    mv "$d" "$d2"
  fi
done