INDEX_RESIZE=0
for file in ./*.jpg; do
    [ -e "$file" ] || continue
    convert $file -resize 1000x1000^ $file
    let INDEX_RESIZE=$(expr $INDEX_RESIZE+1)
done

INDEX_THUMBNAIL=0
for file in ./*.jpg; do
    [ -e "$file" ] || continue
    convert $file -resize 200x200^ ${INDEX_THUMBNAIL}-thumbnail.jpg
    let INDEX_THUMBNAIL=$(expr $INDEX_THUMBNAIL+1)
done