bash rename

for old in ./images*.png; do
    new=$(echo $old | sed -e 's/\.png$/test.png/')
    mv -v "$old" "$new"
  done


 for old in ./240x320jpg_72dpi/*_h.jpg; do
\ new=$(echo $old | sed -e 's/\_h.jpg$/.jpg/')
\ mv -v "$old" "$new"