6,16,2003
Jeng-sheng Yeh

Below script could move filename to lower case.

for filename in $(ls |grep [A-Z]); do mv $filename $(echo $filename |tr [:upper:] [:lower:]); done

I learned above script from:
[buug] lowercase coversion of filenames 
(http://www.weak.org/pipermail/buug/2002-August/001176.html)