Chmod Calculator - Calculate Linux File Permissions Online

Outstanding features

What is chmod and why is it important for server security?

Chmod (change mode) is a Linux/Unix command to change file and directory permissions - one of the most important commands in server administration. Each file/folder has 3 groups of permissions: Owner (owner - user who created the file), Group (group - users in the same group), Others (others - all remaining users). Each group has 3 rights: Read (read content), Write (write/edit/delete), Execute (execute if it is a script, or access if it is a folder). Setting chmod correctly is very important for server security: permissions that are too wide (777) create vulnerabilities for hackers to upload and run malicious code, permissions that are too narrow cause the website to not work or upload files. This tool helps you calculate and understand chmod without having to remember complicated numbers.

Benefits when used

• •Secure servers and websites from attacks
• •Avoid errors
• •when accessing file
• •Manage file/folder permissions easily and accurately
• •No need to remember complicated octal numbers
• •Quickly debug permission issues on the server
• •Understand clearly the meaning of each right r, w, x
• •Set up correct permissions for web server, upload folders
• •Save time looking up documentation

Detailed instructions on how to use Chmod Calculator

1. 1View copyright table with 3 rows: Owner, Group, Others
2. 2Tick ​​the checkboxes Read(4), Write(2), Execute(1) for each group
3. 3See octal results (e.g. 755) automatically updated
4. 4See symbolic notation (rwxr-xr-x) corresponding to
5. 5Or click on common permissions (755, 644...) to quickly apply
6. 6Or enter the 3-digit octal number in the input box to convert back
7. 7Copy command
8. 8for use on terminal
9. 9Thay
10. 10with your actual file/folder name