find . -type f -name "*.done" | \
sort | while read donefile; do \
undonefile=`echo $donefile | sed 's/.done//'`; \
mv -v "$donefile" "$undonefile"; \
done
sort | while read donefile; do \
undonefile=`echo $donefile | sed 's/.done//'`; \
mv -v "$donefile" "$undonefile"; \
done