redis-cli -h 127.0.0.1 -p 30000 keys "*"
redis-cli -h 127.0.0.1 -p 30000 -n 0 keys "*"
redis-cli -h 127.0.0.1 -p 30000 -n 1 keys "*"
redis-cli -h 127.0.0.1 -p 30000 -n 1 hgetall recommend_list