I am writing a short script. One functionality is synchronizing two folders. Now I have two variables with directories to two different folder: `DIRECTORY_1` and `DIRECTORY_2`. In both folders are files and other folders. I need to synchronize these folder to have all files in both folders. For example:

1. In `DIRECTORY_1` I have file1, file2, file3 and folder1
2. In `DIRECTORY_2` I have file4, file5, file6 and folder2
3. I need comment after which I will have in both directories files1-6 and folders1-2.

I was trying rsync command but it doesn't work properly.