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redis 127.0.0.1:6379> EXISTS KEY_NAME

redis 127.0.0.1:6379> EXISTS tutorialpro-new-key
(integer) 0

redis 127.0.0.1:6379> set tutorialpro-new-key newkey
OK
redis 127.0.0.1:6379> EXISTS tutorialpro-new-key
(integer) 1
redis 127.0.0.1:6379>