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That's a bit ugly. You end up with lots of files called picture.png.jpg
How about this:
for img in *.png; do convert "$img" "${img%png}jpg" ; doneIt strips off the suffix (png), then adds a new one (jpg).
or you could use sed, but flatcaps is a better way
for img in *.png; do convert "$img" "$img.jpg" | sed 's/\.png$/\.jpg/'
Why so complicated? Try
mogrify -format jpg *.png