Edit multiple images with imagemagik (resize, optimize and thumbnail)

thumb.sh

# RESIZE AND OPTIMIZE (based in height)
HEIGHT=500
mkdir -p result
for f in *.jpg; do 
    convert "$f" -resize "x${HEIGHT}" -strip -quality 90% "result/$f"
done

# THUMB
WIDTH=200
HEIGHT=225
mkdir -p thumb
for f in *.jpg; do
    convert "$f" -strip -quality 90% -resize "${WIDTH}x${HEIGHT}^" -gravity center -crop "${WIDTH}x${HEIGHT}+0+0" "thumb/$f"
done