Besides having a terminal open, let's create some test data:
$ mkdir -p parentdir/child_with_kids$ mkdir -p parentdir/second_child_with_kids$ mkdir -p parentdir/child_with_kids/grand_kid/$ touch parentdir/child.txt parentdir/child_with_kids/child.txt parentdir/child_with_kids/grand_kid/gkid1.txt$ touch parentdir/second_child_with_kids/cousin1.txt parentdir/z_child.txt parentdir/child.txt parentdir/child2.txt
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