public Command withCommandId(String commandId) {
        setCommandId(commandId);
        return this;
    }
<p>
A unique identifier for this command.
</p>

@param commandId
       A unique identifier for this command.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/Command.java