woocode / sh / resize_img.sh

#!/bin/sh

CONVERT=/usr/bin/convert
PROCESSES=2

IMG_DIR=${1:?"$0 IMG_DIR"}
_PER=$2
RESIZE_PERCENT=${_PER:="30%"}

test -d $IMG_DIR || exit 2

for img in $IMG_DIR/*.JPG
do
    echo "Resizing $img to $RESIZE_PERCENT ..."
    $CONVERT -resize $RESIZE_PERCENT $img $img &
    PROCESSES=$(($PROCESSES-1))
    if [ $PROCESSES -eq "0" ]
    then
        echo "waiting to be finished ..."
        wait
        echo "done"
        PROCESSES=2
    fi
done

wait
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