Bulk resize images with a shell script and imagemagick

I like to resize images to 1000 pixels wide before sending them per email, it's large enough for most screens and I can send a dozen of pictures without cluttering my friends inbox. A pity that in 2015 there is still no easy way to do this integrated in the Gnome file manager. Maybe there is another way, or maybe I should use a proper image management program. Add a comment on how you resize images. 
 
But it's easy to create a shell script:

#!/bin/sh
mkdir -p small
for i in *.jpg; do
    echo $i;
    convert $i -resize 1000x small/$(basename $i .jpg).jpg;
done

Since I had images ending with .JPG extension in capital letters, I added a second loop:

for i in *.JPG; do
    echo $i;
    convert $i -resize 1000x small/$(basename $i .JPG).jpg;
done

Inspired by this question on stack overflow, and the mkdir complain corrected by looking at this question.