This tool is a simple command-line Ethereum address validator written in Rust that checks whether a given address has a valid 0x prefix, correct length, and valid hexadecimal characters.
Clone the repository, make sure Rust is installed, then run the program using Cargo with a single argument: cargo run -- <ethereum_address> Example:
cargo run -- 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
A valid input prints a success message to standard output and returns exit code 0:
Valid address: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
An invalid input prints an error message to standard error and returns exit code 1:
Invalid address: 0x123invalidaddress...
This project reinforced that string slices (&str) are borrowed references, meaning we can pass around and validate data without taking ownership of the String, avoiding unnecessary cloning and making the program more efficient. A proper CLI tool must validate input before accessing it, handle missing arguments gracefully, and separate normal output (stdout) from error messages (stderr) while using exit codes to communicate success or failure to the operating system.