有幾十萬張圖片，希望用shell指令碼批量生成縮圖。使用GraphicsMagick 庫進行圖片處理

1.GraphicsMagick 

#!/bin/bash
#arg1: nowdir  arg2: now thumb dir  arg3: nowforder
function bianli(){
for file in `ls $1`
do
	echo $file
	image="${1}/${file}"
	thumb="${2}/${file}"
	
	if [ -d ${image} ]
	then
		mkdir ${thumb}
		bianli ${image} ${thumb}
	elif [ ! -f ${thumb} ]
	then
		echo $thumb
		convert -resize "200x356>" -quality 85 -strip ${image} ${thumb}
	else
		echo "already exists"
	fi
	echo "***************"
done
}
bianli /media/data/WEBUPV/images /media/data/WEBUPV/thumb