#!/bin/sh 

function die {
    echo $1
    exit
}

#проверяем, установлен ли convert
which convert >& /dev/null || die "Error: convert is needed, it's a part of ImageMagick"

DIR=$1
#наши старые файлы копируем в DIR.old
mkdir "$DIR.old"
cp $DIR/* $DIR.old/

echo "Start resizing to 1280x960...." 
mogrify -resize 1280x960 $DIR/* || die "Job done with some errors."

echo "Job done!";
echo "You can find your old files in $DIR.old"