What is machineid-cli?

machineid-cli is a small command-line tool that generates a unique "device ID" for a computer. Think of it like a fingerprint for your machine, instead of identifying a person, it identifies a specific computer so that software can tell machines apart, verify licenses, or track which device is connecting to a service. You run it from a terminal, and it produces an ID by combining various pieces of information about your computer. You can choose which pieces to include: the system's UUID, the number of CPU cores, the operating system name, the current username, the machine's name on the network, its MAC address, the CPU vendor ID, or the serial number of the main disk. By default it just uses the system UUID, but you can tell it to combine all of these ("everything") or pick specific ones. The tool then runs that information through an encryption method (MD5 by default, with SHA-256 and SHA-1 as alternatives) to produce a condensed identifier string. Someone licensing desktop software, for instance, might use a tool like this to tie a license key to a specific machine so it can't be shared across dozens of computers. Or a fleet manager keeping track of company laptops could generate a stable ID for each device. The tool also lets you supply your own encryption key or point it to a file whose contents serve as the key, which adds a layer of customization to how the final ID is produced. The project is written in Rust and distributed as a standalone binary, so there's no heavy setup or dependencies to install, you just download and run it. The README is straightforward and limited to usage instructions, so it doesn't offer guidance on best practices for which data sources to combine or how to handle edge cases like hardware changes that might alter the resulting ID.