# CHMOD Lab: Linux Permissions

> CHMOD Lab: Linux Permissions (iPhone/iPad app by Guy Miller.)

- Source: https://appshunter.io/ios/app/chmod-lab/id6757230787 (this page in markdown: same URL + `.md`)
- Developer: [Guy Miller](https://appshunter.io/developer/1865478036)
- Category: Utilities, Developer Tools
- Price: Free
- Age rating: 4+
- Requires: iOS 17.6 · 2 MB
- Languages: American English
- Released: 2026-01-06
- Data updated: 2026-02-23
- User reviews in markdown: https://appshunter.io/ios/app/chmod-lab/id6757230787/reviews.md

## What is CHMOD Lab?

Stop guessing Linux file permissions. CHMOD Lab is the ultimate interactive sandbox and calculator for developers, SysAdmins, and students who want to master the command line.

Whether you are configuring a web server, debugging a script, or studying for your Linux certification, CHMOD Lab bridges the gap between confusing octal numbers (755) and symbolic notation (rwxr-xr-x).

FEATURES:

• Interactive Calculator: Toggle permissions instantly. Tap "Read," "Write," or "Execute" and watch the Octal and Symbolic codes update in real-time.

• Reverse Lookup: Type in a code like "644" and see exactly which permissions are granted.

• Visual Sandbox: See permissions visualized to understand "who" can do "what" before you run the command.

• Cheat Sheet: Built-in reference guides for common permission patterns.

Master the command line. Download CHMOD Lab today.


## Version history (last 1 release)

### 1.0 — 2026-01-06

No release notes.

## More apps by Guy Miller

- [Subnet Lab Pro](https://appshunter.io/ios/app/subnet-lab-pro/id6757671140)

All apps by Guy Miller: https://appshunter.io/developer/1865478036

## Related topics

[chmod util](https://appshunter.io/ios/topics/chmod-util)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-02-23.*