makeMore.sh

#!/bin/bash

# modify these two variables to be the width and height of your desired alternates
thumbbox=250
thumbwidth=250
thumbheight=250

coverbox=750
coverwidth=750
coverheight=300

clear

echo Resizing your images and making cover images and thumbnails

for img in `ls *.jpg`
do
    name=${img%.*}
    ext=${img#*.}
    convert -adaptive-resize ${thumbwidth}x${thumbheight}^ -gravity center -crop ${thumbwidth}x${thumbheight}+0+0 $img $name-thumb.$ext
    convert -adaptive-resize ${coverbox}x${coverbox} -gravity center -crop ${coverwidth}x${coverheight}+0+0 $img $name-cover.$ext
done