I found a solution at http://dptnt.com/2007/06/how-to-find-out-the-total-shutter-actuations-of-your-dslr/
exiftool -d %Y%m%d-%H%M%S '-FileName<${CreateDate}${SubSecTimeOriginal}_${ShutterCount}_${SerialNum
+ber}.nef' *.nef
The ShutterCount is the same as the ImageNumber in Lightroom. Yahoo!
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Alyda