About (Operator Information)
Last updated: December 17, 2025
Penguin Gym Linux is a practice-focused Linux learning platform operated with the goal of creating a world where everyone can easily learn the power of Linux.
We provide a learning environment where you can experience Linux commands in your browser without any installation.
1. Operator Information
Operator: Rainy-sensei (X: @linuxgympenguin) / Jiro Sakamoto
Title: Web Engineer / Technical Education Content Creator
Operating Form: Individual Operation
Location: Nerima-ku, Tokyo, Japan
Contact Email: contact@penguin-gym-linux.com
Response Time: Approximately 3 business days
Operation Start: November 2024
Usage Fee: Free (supported by advertising revenue)
Languages Provided: Japanese, English
Service Region: Japan and overseas (for Japanese and English speakers)
2. Purpose of This Site
Our purpose is to remove the "difficulty of environment setup" and "fear of breaking things" that many people stumble on in the early stages of Linux learning, and create a state where you can start hands-on learning as quickly as possible.
- Start immediately without installation
- Experience close to actual Linux operations in a safe environment
- Focused on structure and navigation that beginners won't get lost in
3. Content We Provide
- Linux operation experience through a virtual terminal running in your browser
- Tutorial and guide articles for beginners to practitioners
- Troubleshooting explanations frequently encountered in practice
4. Content Creation Policy
- Emphasis on reproducible procedures, command examples, and output examples
- Operations that beginners are likely to make mistakes with always include warnings and workarounds
- Continuous improvement and updates based on feedback
5. About Monetization
This site uses advertising revenue for continued operation and quality improvement.
- Advertising: Google AdSense
- Content neutrality is always prioritized
6. Disclaimer
- The information on this site is intended for learning support purposes
- The operator is not responsible for any damages caused by use
- When executing commands in production environments, always verify and backup at your own responsibility