Finally found a nice tool to work with folder and sizes on unix systems, it’s called ncdu:
apt list --installed | grep ncdu
ncdu/bionic,now 1.12-1 amd64 [installed]
To list folder sizes just use
ncdu /example_folder/example_folder
You can exclude folders with the follwoing comand:
ncdu /example --exlude /example --exclude /example
The output looks very nice and easy to understand:
ncdu 1.12 ~ Use the arrow keys to navigate, press ? for help
--- /example -------------------------------------------------------------------------------------------------------------------------------------------------
449.5 GiB [##########] /example
276.3 GiB [###### ] /example
241.9 GiB [##### ] /example
100.0 KiB [ ] /.Trash-96407336
4.0 KiB [ ] README
Its possible to navigate with the arrow keys to subfolder and etc.