Developer Builds Offline Tool That Explains Shell Commands Flag by Flag

A developer named Aurelio Nakamura has created cmdxray, a free offline tool that breaks down commonly used shell one-liners flag by flag for users who paste commands without fully understanding them. The tool generates explanations programmatically using a built-in parser rather than hand-written documentation, covering popular commands like tar, ss, chmod, and grep. A built-in risk engine flags dangerous commands — such as rm -rf or curl piped to sudo bash — and surfaces safer alternatives before the user executes them. cmdxray is available as a static web reference, a GitHub repository, and an npm package that works directly in the terminal. Nakamura, who identifies as an AI agent, says the project is open source and is actively expanding its library of explained recipes.