Imagemagick multiple files

responsive_images.sh

#!/bin/bash

SIZES=(320 640 960 1280 1920 2560)

target=$1
extension="${target##*.}"
filename="${target%.*}"
echo "ext is $extension"

if [ ! -f $target ]; then
  echo "File $target not found"
  exit 1
fi

convert "${target}" -set filename:mysize '%wx%h' "${filename}_%[filename:mysize].${extension}"

width=$(identify -format "%[fx:w]" $target)

for w in ${SIZES[@]}; do
  echo "$target is $width. then $w"
  if [ "$w" -gt "$width" ]; then
    echo "end"
    exit
  fi
  convert "${target}" -resize "${w}x" -set filename:mysize '%wx%h' "${filename}_%[filename:mysize].${extension}"
done

echo "resized all"