Where did Jayce discover essential device files on the Linux system with an FHS file system?

In a Linux system that follows the Filesystem Hierarchy Standard (FHS), essential device files are typically found in the /dev directory. This directory contains special files that represent devices on the system, allowing software to interact with hardware components such as disks, terminals, and other peripherals. Each entry in /dev serves as a link to the actual interfaces provided by the hardware, which is an essential part of the operating system's functionality.

The /dev directory is critical for the operation of the Linux system as it provides the necessary mechanisms for device management. It enables developers and users to perform input and output operations on devices seamlessly, often without needing to understand the hardware specifics.

In contrast, the other directories serve different purposes: /etc contains configuration files for the system, /bin holds essential user command binaries that are necessary for booting and repairing the system, and /usr is typically used for user applications and utilities. These other directories do not house essential device files in the same way that /dev does.