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This command is very similar to `DEL`: it removes the specified keys. Just like
`DEL` a key is ignored if it does not exist. However the command performs the
actual memory reclaiming in a different thread, so it is not blocking, while
`DEL` is. This is where the command name comes from: the command just
**unlinks** the keys from the keyspace. The actual removal will happen later
asynchronously.
@return
@integer-reply: The number of keys that were unlinked.
@examples
```cli
SET key1 "Hello"
SET key2 "World"
UNLINK key1 key2 key3
```
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