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#!/bin/bash

...
    convert -geometry 800x600 $image ${image/./-l.}
    convert -geometry 80x60 $image ${image/./-s.}
done

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ben@Tyr:/tmp/Sorayama$ ../thumbnail
hajime1.jpg
...
converting hajime8.jpg ...
convert: invalid argument for option `hajime8-l.jpgxhajime8.jpg!': -re
+size.
convert: invalid argument for option `hajime8-s.jpgxhajime8.jpg!': -re
+size.