convert jpgをpngに変換

#!/bin/bash                                                                                                                                   
data=`convert $1 -bordercolor white -border 1x1 -matte -fill none -fuzz 20%  -draw 'matte 0,0 floodfill' -shave 1x1   $1`
result=$?
if [ $result -ne "0" ]
then
   `rm $1`
fi
echo $1 >> "rm.txt"