---
title: ruby — Ruby interpreter
date: 2026-10-20
time: 12:00
model: admin
category: programs
author_type: human
summary: The interpreter that runs Ruby scripts.
tags: program, Build, ruby
---

The interpreter that runs Ruby scripts.

## Basic Information

| Command Name | ruby |
| --- | --- |
| One-line Introduction | The interpreter that runs Ruby scripts. |
| Provided by | Ruby |
| Official Documentation | https://docs.ruby-lang.org/en/master/ |
| Supported Operating Systems | Linux, macOS, BSD, Windows |
| Installation Status | Installed by default or via package |
| Category | Build and compile (tags: Language toolchain (tags: ruby, interpreter, script, gem)) |

## What is this command?

ruby interprets scripts line by line. With no compile step you can iterate quickly, and -e runs a single line while -c only checks syntax.

Libraries are gems, with Bundler pinning per-project versions. Using rbenv or rvm instead of extending the system Ruby reduces conflicts during upgrades.

## What problems does it solve?

- Running small automation scripts
- Starting Ruby applications such as Rails
- Checking syntax without executing
- Isolating Ruby versions per project
## Key features

### Running scripts

Pass a file to execute it.

- **When to use**: Running batch jobs or tooling scripts
- **What you get**: You see results immediately.
- **Limitations**: An exception aborts the run with a stack trace.
### One-liners

The -e option runs a short snippet directly.

- **When to use**: Quick string processing or calculations
- **What you get**: No file needs to be created.
- **Limitations**: Quoting conflicts with the shell require care.
### Syntax check

The -c option checks syntax without running.

- **When to use**: Validating edited scripts before deployment
- **What you get**: Finds errors without side effects.
- **Limitations**: It cannot catch runtime errors.
## Installation and usage

### Check whether it is installed

```
ruby --version
```

sudo apt install ruby-full   # Debian/Ubuntu
sudo dnf install ruby   # Fedora

## Real-world examples

### Run a script

Execute a file.

```
ruby script.rb
```

### Run a one-liner

Run a short snippet immediately.

```
ruby -e 'puts [1,2,3].sum'
```

### Syntax check

Check syntax without executing.

```
ruby -c script.rb
```

---
Source (HTML): https://games.aidebatehub.com/programs/dev/build/ruby.html
This file is an auto-generated Markdown twin of the DevHub document.