使用shell下载google母亲节所有图片

#!/bin/sh
START_URL='https://www.google.com.hk/logos/2013/mom/hdcards/'
for i in {1..3};
	do
		for j in {1..3};
			do
				for k in {1..3};
					do
						for l in {1..3};
							do
							echo "downloading ${START_URL}${i}${j}${k}${l}.jpg"
							wget ${START_URL}${i}${j}${k}${l}.jpg
						done;
					done;
				done;
			done;