Chmod Calculator
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
group Permissions
others Permissions
Special Permissions
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
Examples of Real-World Usage
6 real-world examples
System Administrators & DevOps Engineers
Easily configure secure file permissions for servers, ensuring compliance and best practices.
Developers & Programmers
Set correct file permissions for scripts, executables, and development projects to avoid security risks.
Cybersecurity & IT Security Professionals
Analyze and adjust file permissions to protect sensitive data and prevent unauthorized access.
Linux & Unix Beginners
Learn chmod commands interactively with real-time explanations and best practice recommendations.
Educators & Students
Teach and understand Unix file permission structures through a visual, hands-on chmod calculator.
Web Hosting & Server Administrators
Manage website and server file permissions efficiently to ensure security and proper access control.
Comprehensive Permission Management
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.
Real-time Command Generation
See the chmod command update instantly as you modify permissions.
Special Permission Support
Handle SetUID, SetGID, and Sticky Bit with clear explanations.
Security Warnings
Get instant feedback about potential security risks in your permission settings.
Detailed Explanations
Learn what each permission means with clear, contextual explanations.
Best Practices Guide
Access common permission patterns and security recommendations.
How to Use
Simple 6-step process
Step 1
Select user categories (owner, group, others) to set permissions for.
Step 2
Toggle read, write, and execute permissions using the switches.
Step 3
Enable special permissions (SetUID, SetGID, Sticky Bit) if needed.
Step 4
Review security warnings and best practice recommendations.
Step 5
Copy the generated chmod command for your use.
Step 6
Read the detailed explanation of your permission configuration.
Frequently Asked Questions
Everything you need to know about our process, pricing, and technical capabilities.
See Full FAQChmod (Change Mode) is a command in Unix and Unix-like systems that allows changing file permissions. It's crucial for: Controlling file access security Setting appropriate permissions for different users Protecting sensitive data Managing executable files
The three-digit number represents permissions for Owner, Group, and Others: 4 = Read permission 2 = Write permission 1 = Execute permission Add numbers for combined permissions (e.g., 7 = 4+2+1 = read+write+execute)
Special permissions provide additional control: SetUID (4xxx): Executes file with owner permissions SetGID (2xxx): Executes with group permissions Sticky Bit (1xxx): Prevents deletion by non-owners
Common chmod patterns include: 755: Standard for executable files 644: Standard for regular files 600: Private files (owner only) 777: Full access (use with caution)
Both modes represent permissions differently: Numeric: Uses numbers (e.g., 755) Symbolic: Uses letters (e.g., rwxr-xr-x)
Recursive chmod applies permissions to all files and directories within a directory. Use it when: Setting up new project directories Fixing permissions across many files Note: Use with caution to avoid security issues
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