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find . -depth -name '* *' \ | while IFS= read -r f ; do mv -i "$f" "$(dirname "$f")/$(basename "$f"|tr ' ' _)" ; done
failed to get it right at first, because I didn't think of directories.
find . -depth -name '* *' \ | while read f ; do mv -i "$f" "$(dirname "$f")/$(basename "$f"|tr ' ' _)" ; done
find . -depth -name '* *' -depth \ | while read f ; do mv -i "$f" "$(dirname "$f")/$(basename "$f"|tr ' ' _)" ; done
find . -name '* *' -depth \ | while read f ; do mv -i "$f" "$(dirname "$f")/$(basename "$f"|tr ' ' _)" ; done
find . -name '* *' | sort -rdepth \ | while read f ; do mv -i "$f" "$(dirname "$f")/$(basename "$f"|tr ' ' _)" ; done
find . -name '* *' | sort -r \ | while read f ; do mv -i "$f" "$(dirname "$f")/$(basename "$f"|tr ' ' _)" ; done
