extract files in all folders into a single folder.

extract.sh

tmp_dir="/tmp/xyz_data"

mkdir -p "$tmp_dir"

for folder in "$source_dir"/*; do
  if [ -d "$folder" ]; then
    folder_name=$(basename "$folder")
    cp "$folder"/* "$tmp_dir"
  fi
done

mv "$tmp_dir" "$destination_dir"

count=$(ls -p "$destination_dir" | grep -v / | wc -l)

echo "done $count files."