🧮 Chmod Permission Calculator

Owner

Owner Permissions

Read

Write

Execute

Group

Group Permissions

Read

Write

Execute

Public / World

Public Permissions

Read

Write

Execute

Octal (e.g., 755):

Symbolic (e.g., rwxr-xr--):

Symbolic: rwxr-xr--

Octal: 755

chmod -R 755 filename

Reference Mode

This mode provides a reference for different file permissions.

Common Directory Permissions

755 - Standard for directories that don't need write access by group/others
775 - Directories that need group write access
700 - Private directories (owner access only)

Common File Permissions

644 - Standard for regular files
664 - Files that need group write access
600 - Private/sensitive files
755 - Executable files

Special Cases

File/Directory Type	Recommended Permission	Reasoning
SSL Private Keys	`600`	Contains highly sensitive data
Log Directories	`775`	Needs write access for application
Backup Files	`600`	Often contain sensitive data
Public Content	`644`	Read access needed by web server

Security Warning

Avoid using 777(full access for everyone) as it poses significant security risks. If you think you need 777, there's likely a better solution involving proper user/group ownership.