How to Build a CLI Tool with Rust: Step-by-Step Tutorial

Rust has quietly become the go-to language for building command-line tools. From ripgrep to bat to fd, the most beloved CLI utilities of the past few years are written in Rust — and for good reason. Rust gives you C-level performance, memory safety without a garbage collector, and an ecosystem of crates specifically designed for CLI development. If you've ever wanted to build a fast, reliable command-line tool that works everywhere, Rust is the right choice. In this tutorial, we'll build a complete CLI tool from scratch — a file search and transform utility called fxr that can find files, search content, convert between formats, and produce beautifully colored output. Along the way, you'll learn argument parsing with clap, error handling with anyhow, JSON and YAML processing, progress bars, testing strategies, cross-compilation, and distribution. By the end, you'll have a production-ready CLI tool and the knowledge to build your own. If you're working with JSON or YAML data alongside y