value at the tail of the list stored at
key, only if
exists and holds a list.
In contrary to
RPUSH, no operation will be performed when
key does not yet
@integer-reply: the length of the list after the push operation.
RPUSH mylist "Hello" RPUSHX mylist "World" RPUSHX myotherlist "World" LRANGE mylist 0 -1 LRANGE myotherlist 0 -1