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Read-only variant of the `SORT` command. It is exactly like the original `SORT` but refuses the `STORE` option and can safely be used in read-only replicas.
Since the original `SORT` has a `STORE` option it is technically flagged as a writing command in the Redis command table. For this reason read-only replicas in a Redis Cluster will redirect it to the master instance even if the connection is in read-only mode (see the `READONLY` command of Redis Cluster).
The `SORT_RO` variant was introduced in order to allow `SORT` behavior in read-only replicas without breaking compatibility on command flags.
See original `SORT` for more details.
@examples
```
SORT_RO mylist BY weight_*->fieldname GET object_*->fieldname
```
@return
@array-reply: a list of sorted elements.
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