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Arthas支持丰富的自动补全功能，在使用有疑惑时，可以输入`Tab`来获取更多信息。
比如输入 `sysprop java.` 之后，再输入`Tab`，会补全出对应的key：
```
$ sysprop java.
java.runtime.name java.protocol.handler.pkgs java.vm.version
java.vm.vendor java.vendor.url java.vm.name
...