大量のダミー連番画像を、一行で作成する方法 ref: http://qiita.com/katapad/items/e79a01054c13083932a0

file0.txt

curl -O 'http://placeimg.com/500/480/tech/[0-4].jpg'

file1.html

<img src="http://cambelt.co/200x100" />

file1.txt

curl -O 'http://placehold.it/350x150&text=[1-4].png'

file2.html

<img src="http://cambelt.co/400x160/UNKO?font=Federicka&color=234653,eeeeee&font_size=120"> 

file2.txt

curl -O 'http://cambelt.co/400x150/[0-4].png'

file3.html

<img src="http://cambelt.co/200x100" />

file3.txt

curl -O 'http://cambelt.co/400x150/[0-4]_[0-4].png'

file4.html

<img src="http://cambelt.co/400x160/UNKO?font=Federicka&color=234653,eeeeee&font_size=120"> 

file5.txt

curl -O 'http://cambelt.co/400x150/[0-4]_[0-4].png'