Chmod Calculator
Convert between octal and symbolic Linux file permissions.
owner
group
Public
Symbolic Mode
-rwxr-xr-x
Quick Presets:
Understanding Chmod Permissions
In Linux and Unix-like systems, chmod (change mode) is a command used to set the access permissions of files and directories.
The Octal Values
The three numbers in an octal permission represent the Owner, Group, and Others. Each number is a sum of its component bits:
- 4: Read (r)
- 2: Write (w)
- 1: Execute (x)
- 0: No permission
Common Permission Examples
- 755: Used for directories and executable files. Everyone can read and execute, but only the owner can write.
- 644: Standard for public files (HTML, images). Everyone can read, but only the owner can write.
- 600: Sensitive data files. Only the owner can read and write.