SUCCESS!! Sort of ....
I did a low-level format of the HD and then a regular, not quick, format, and I purchased a new SD card.
Now I am able to delete the contents of the folder crengine/.cache with
#!/bin/sh
rm -rf /root/abook/crengine/.cache/*
rm -rf /home/crengine/.cache/*
However, rm -rf /mnt/crengine/.cache/* still does not work but that's okay, at least I know now that there must have been something still "stuck" in the PP that got eliminated with the low-level format and the cache is now being cleared as intended.
Thanks to all the folks out there that helped me think this through!
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