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Chmod Permissions Calculator & Linux Command Generator

100% Client-Side: Zero Data Leaves Your Browser

Interactive Chmod Calculator & Permission Generator

Calculate Linux/Unix octal file permissions, symbolic strings (-rwxr-xr-x), and generate terminal commands.

Standard Security Presets:
RoleRead (4)Write (2)Execute (1)Octal
Owner User (u)6
Group Group (g)4
Others Public (o)4
Special Permissions:
Octal Value
0644
Symbolic Format
-rw-r–r–
chmod 0644 /var/www/html/index.php

Understanding Linux File Permissions & Chmod

In Unix and Linux operating systems, every file and directory is governed by a strict access-control matrix comprising three primary roles:

  • Owner (u): The individual user account that created or owns the file.
  • Group (g): Members of the assigned user group sharing common project or operational access.
  • Others / Public (o): All other accounts on the system or anonymous web visitors.

How Octal Notation Works

Each access right corresponds to a specific binary bit and decimal value:

  • Read (r) = 4
  • Write (w) = 2
  • Execute (x) = 1

The permission triplet is calculated by summing the values. For example: Read (4) + Write (2) = 6.

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Queryiest – Technology Writer | Software Developer | Digital Learning Enthusiast

Queryiest is a technology writer, software developer, and knowledge-sharing enthusiast passionate about simplifying complex technical concepts for students, professionals, and lifelong learners. With expertise in software development, programming, cybersecurity, artificial intelligence, digital tools, and emerging technologies, Queryiest creates practical, research-driven content that helps readers solve real-world problems. As a regular contributor to RTSALL, Queryiest publishes easy-to-understand guides, coding resources, technology news, career advice, and educational tutorials designed for beginners and professionals alike. Every article focuses on accuracy, clarity, and actionable insights to help readers stay informed in the rapidly evolving digital world. Whether it's programming, software engineering, AI, cybersecurity, online platforms, or digital productivity, Queryiest believes that quality knowledge should be accessible to everyone. The goal is to build a trusted learning resource where readers can discover reliable answers, improve their technical skills, and make informed decisions. Areas of Expertise: Software Development, Programming, Cybersecurity, Artificial Intelligence, Technology News, Coding Interview Preparation, Digital Learning, Productivity Tools, and Online Knowledge Sharing.