SORT key [BY pattern] [LIMIT offset count] [GET pattern [GET pattern ...]] [ASC|DESC] [ALPHA] [STORE destination]
SORT myurl get # get rank-* alpha
myurl(set)
Baidu.com
Facebook.com
Google.com
Yahoo.com
Youtube.com
string
rank-Baidu.com
5
rank-Facebook.com
2
rank-Google.com
1
rank-Yahoo.com
4
rank-Youtube.com
3