The ICommandManager interface is managing commands. So you can use it to get and execute commands.
You can get this from an IServer object.

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It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.
import crafttweaker.command.ICommandManager;

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<th>
  Type
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<td>
  Map<String, <a href="/Vanilla/Commands/ICommand/">ICommand</a>\>
</td>
ZenGetter
commands

To add your own command, look at CommandEvent