I misspelled a word when I exported a large group of photos from Aperture. I did not want to repeat the operation, so I renamed the files at a bash prompt in Terminal:
for FILE in * ; do NEWNAME=`echo $FILE | sed 's/oldstring/newstring/g' ` ; mv "$FILE" "$NEWNAME" ; done
Just change ‘oldstring’ and ‘newstring’ to the values needed.
