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redis 127.0.0.1:6379> HEXISTS KEY_NAME FIELD_NAME

redis 127.0.0.1:6379> HSET myhash field1 "foo"
(integer) 1
redis 127.0.0.1:6379> HEXISTS myhash field1
(integer) 1
redis 127.0.0.1:6379> HEXISTS myhash field2
(integer) 0