Final answer:
Hotplug devices can be connected or disconnected while the system is running, while coldplug devices require a system restart. Sysfs provides information about devices and drivers. The system recognizes device additions or removals through polling or interrupts. Udev dynamically creates device files when devices are added.
Step-by-step explanation:
The difference between a hotplug and a coldplug device is that a hotplug device can be connected or disconnected from a system while it is running, without needing to restart the system. On the other hand, a coldplug device requires the system to be restarted for it to be recognized and used.
Coldplug devices are typically those that are connected to the system during the system's boot process or those that are rarely connected or disconnected.
The sysfs virtual file system provides a way for the kernel to export information about devices and drivers to user space. It presents a hierarchical view of devices and their attributes.
Sysfs is located at /sys directory in the root file system of a Linux-based system.
When a device is added or removed from the system, the system recognizes it through mechanisms like polling or interrupts. The kernel receives notifications from the hardware and takes appropriate actions based on the type of device event.
The utility that dynamically creates device files as devices are added to the system is called udev. It is responsible for managing device nodes in /dev directory.