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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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