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+Renames `key` to `newkey` if `newkey` does not yet exist.
+It returns an error when `key` does not exist.
+
+In Cluster mode, both `key` and `newkey` must be in the same **hash slot**, meaning that in practice only keys that have the same hash tag can be reliably renamed in cluster.
+
+@return
+
+@integer-reply, specifically:
+
+* `1` if `key` was renamed to `newkey`.
+* `0` if `newkey` already exists.
+
+@examples
+
+```cli
+SET mykey "Hello"
+SET myotherkey "World"
+RENAMENX mykey myotherkey
+GET myotherkey
+```