Which command allows you to modify the internal state of udev?

The command that allows you to modify the internal state of udev is udevadm control. This command is part of the udev management toolset and is used for controlling the runtime behavior of the udev daemon. It can be utilized to reload udev rules, trigger events, or change the configuration of udev and how it manages device events.

This command enables you to send commands to the udev daemon, which affects how it behaves with newly connected devices or how it responds to existing devices already managed by udev. For instance, with udevadm control, you can tell the daemon to reload its rules and apply any changes made to rules without needing to restart the entire system.

The other commands, while important in their own right, serve different purposes. For example, modify and change suggest the alteration of device attributes or properties but are not the commands used to change the internal state of udev itself. Additionally, update is not a valid option in this context, as it does not exist as a command for udevadm.