Imagemagick to rezise batch pictures

Load up imagemagick:

sudo apt-get install imagemagick

Graces large (3.0mb-ish) files go to 800×600 and around 100kb with this command:

convert -resize ‘800×600’ -quality 50 *.JPG websize.jpg

The convert program requires a destination image file name whereas mogriy does not

mogrify replaces instead of duplicates the files