Run – a CLI universal code runner I built while learning Rust

In plain words

Run is a command-line tool for executing code across multiple programming languages, including Python, JavaScript, Ruby, Rust, Go, and C/C++. It supports running code snippets from CLI flags, executing files, processing piped input, and provides interactive REPLs that users can switch between. The tool automatically detects languages from file extensions or explicit flags and handles compilation for compiled languages. Built in Rust with minimal dependencies, Run is designed for developers who work with multiple languages and want a unified interface for quick code execution.

written from the facts on this page · September 2026

From the sources

Universal multi-language runner and smart REPL written in Rust. - Esubaalew/run

In the maker’s words, at launch

Hi HN — I’m learning Rust and decided to build a universal CLI for running code in many languages. The tool, Run, aims to be a single, minimal dependency utility for: running one-off snippets (from CLI flags), running files, reading and executing piped stdin, and providing language-specific REPLs that you can switch…

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