Arthas supports a wide range of auto-completion features, and you can type `Tab` to get more information when you have doubts about your use.

For example, after typing `sysprop java.`, enter `Tab`, which will complete the corresponding key:

```
$ sysprop java.
java.runtime.name             java.protocol.handler.pkgs    java.vm.version
java.vm.vendor                java.vendor.url               java.vm.name
...
```