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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
```
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