ZINCRBY

    1. dragonfly> ZADD myzset 1 "one"
    2. (integer) 1
    4. dragonfly> ZINCRBY myzset 2 "one"
    5. "3"
    6. dragonfly> ZRANGE myzset 0 -1 WITHSCORES
    7. 1) "two"
    8. 3) "one"