Thanks every body. I can try find duplicate files. because those iamges only 
has 
different filename. others are same. 
So I think one command line tool is better. Is there any suggestions ?
I have googled, but only find some tools that you have said. I prefer command 
line tool.

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stardiviner GPG: 5D9F64D8 Twitter: @numbchild
http://stardiviner.dyndns-blog.com

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