[move sub^2 dir to parent dir] #bash

move-nested-dirs.sh

#!/bin/bash

#needed in case we have empty folders
shopt -s nullglob

#we must write the full path here (no ~ character)
target="/path/to/photos"

#we use a glob to list the folders. parsing the output of ls is baaaaaaaddd !!!!
#for every folder in our photo folder ... 
for dir in "$target"/*/ do
	#we list the subdirectories ...
  for sub in "$dir"/*/ do
  	#and we move the content of the subdirectories to the parent
    mv "$sub"/* "$dir"
    #if you want to remove subdirectories once the copy is done, uncoment the next line
    #rm -r "$sub"
  done
done