LPUSHX key value
Inserts value at the head of the list stored at key, only if key already exists and holds a list. In contrary to LPUSH, no operation will be performed when key does not yet exist.
Integer reply: the length of the list after the push operation.
(integer) 1 redis> LPUSHX mylist "Hello" (integer) 2 redis> LPUSHX myotherlist "Hello" (integer) 0 redis> LRANGE mylist 0 -1 1) "Hello"
2) "World" redis> LRANGE myotherlist 0 -1 (empty list or set)
© 2009–2017 Salvatore Sanfilippo
Licensed under the Creative Commons Attribution-ShareAlike License 4.0.
https://redis.io/commands/lpushx