Removes directories which are less than 1028KB total. This works for systems where blank directories are 4KB. If a directory contains 1 MB (1024KB) or less, it will remove the directory using a path relative to the directory where the command was initially executed (safer than some other options I found).
Adjust the 1028 value for your needs.
It would be helpful to test the results before proceeding with the removal. Simply run all but the last two commands to see a list of what will be removed:
du | awk '{if($1<1028)print;}' | cut -d $'\t' -f 2-
If you're unsure what size a blank folder is, test it like this:
mkdir test; du test; rmdir test
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