Chmod Calculator

Free
Utility

Calculate and understand Unix file permissions with our interactive chmod calculator. Features real-time updates and detailed explanations.

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Chmod Permission Calculator

owner Permissions

read
write
execute

group Permissions

read
write
execute

others Permissions

read
write
execute

Special Permissions

SetUID (4)
SetGID (2)
Sticky Bit (1)
Apply recursively (-R)

chmod 750 filename

Numeric: 750 | Symbolic: rwxr-x---

Example Inputs

Quick Reference

Permission Basics

  • • 4 = Read
  • • 2 = Write
  • • 1 = Execute
  • • 0 = No Permission

Special Permissions

  • • SetUID (4): Run as file owner
  • • SetGID (2): Inherit group permissions
  • • Sticky Bit (1): Restrict file deletion

Common Configurations

  • • 755: Executable files/directories
  • • 644: Regular files
  • • 600: Private files
  • • 777: Avoid (Security Risk!)

Permission Explanation

Owner: Read + Write + Execute
Group: Read + Execute
Others: No Permissions

Examples of Real-World Usage

6 real-world examples

Discover how professionals use this tool to solve real problems and boost productivity.

System Administrators & DevOps Engineers

Easily configure secure file permissions for servers, ensuring compliance and best practices.

Proven

Developers & Programmers

Set correct file permissions for scripts, executables, and development projects to avoid security risks.

Proven

Cybersecurity & IT Security Professionals

Analyze and adjust file permissions to protect sensitive data and prevent unauthorized access.

Proven

Linux & Unix Beginners

Learn chmod commands interactively with real-time explanations and best practice recommendations.

Proven

Educators & Students

Teach and understand Unix file permission structures through a visual, hands-on chmod calculator.

Proven

Web Hosting & Server Administrators

Manage website and server file permissions efficiently to ensure security and proper access control.

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Comprehensive Permission Management

Professional Features

Understand and set Unix file permissions with confidence using our interactive calculator.

Interactive Permission Setting

Set file permissions using visual toggles or numeric input with instant updates.

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Real-time Command Generation

See the chmod command update instantly as you modify permissions.

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Special Permission Support

Handle SetUID, SetGID, and Sticky Bit with clear explanations.

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Security Warnings

Get instant feedback about potential security risks in your permission settings.

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Detailed Explanations

Learn what each permission means with clear, contextual explanations.

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Best Practices Guide

Access common permission patterns and security recommendations.

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Features
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How to Use the Chmod Calculator

Simple 6-step process

Follow these easy steps to get started with Chmod Calculator and achieve your goals quickly.

1
Step 1

Select user categories (owner, group, others) to set permissions for.

Easy
2
Step 2

Toggle read, write, and execute permissions using the switches.

Easy
3
Step 3

Enable special permissions (SetUID, SetGID, Sticky Bit) if needed.

Easy
4
Step 4

Review security warnings and best practice recommendations.

Easy
5
Step 5

Copy the generated chmod command for your use.

Easy
6
Step 6

Read the detailed explanation of your permission configuration.

Easy
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