Move all folders inside a parent folder into a new parent folder. If there alre conflicts, only move those folders that are bigger than the existing ones.

merge.sh

source_folder="old_results_2023-04-13"
destination_folder="new_results_2023-05-30"

for file in "$source_folder"/*; do
  filename=$(basename "$file")
  destination_file="$destination_folder/$filename"

  if [[ -e "$destination_file" ]]; then
    source_size=$(stat -c%s "$file")
    destination_size=$(stat -c%s "$destination_file")
    echo $source_size $destination_size
    if [[ $source_size -gt $destination_size ]]; then
      echo "Replacing $filename..."
      mv -f "$file"/* "$destination_file"
    else
      echo "Keeping existing $filename..."
    fi
  else
    echo "Moving $filename..."
    mkdir "$destination_file"
    mv -f "$file"/* "$destination_file"
  fi
done