Chmod Calculator Linux
Calculate and convert Linux file permissions instantly. Interactive chmod permissions calculator with numeric and symbolic notation support.
Interactive Chmod Calculator
Select permissions or enter numeric/symbolic notation
Owner can read, write. Group can read. Others can read.
Common Permission Presets
Click to quickly apply common chmod configurations
Understanding Chmod Permissions
Numeric Notation
Each digit represents permissions for owner, group, and others. Values are calculated by adding: Read (4) + Write (2) + Execute (1).
Symbolic Notation
Shows permissions as a 9-character string: rwxrwxrwx. Each group of three represents owner, group, and others permissions.
Chmod Calculator Features
Interactive Calculator
Visual checkbox interface for easy permission selection
Instant Conversion
Convert between chmod number codes and symbolic notation in real-time
Special Permissions
Support for SETUID, SETGID, and Sticky bit
History Tracking
Keep track of your recent calculations
Favorites
Save frequently used permission configurations
Quick Copy
One-click copy for commands and notations
How to Use the Chmod Command
Chmod Number Calculator - Numeric Notation
Numeric (octal) notation uses three or four digits to represent permissions:
- 4Read permission
- 2Write permission
- 1Execute permission
Add these values together for each user category (owner, group, others).
This gives owner full permissions (7=4+2+1), and group/others read+execute (5=4+1)
Chmod Symbolic Calculator - Symbolic Notation
Symbolic notation uses letters to represent permissions:
- rRead permission
- wWrite permission
- xExecute permission
- -No permission
Format: owner-group-others (9 characters total)
Owner: read+write+execute, Group: read+execute, Others: read+execute
Chmod Examples - Common Permission Values
Standard File
Owner can read/write, others can only read. Perfect for regular files.
Executable/Directory
Owner has full control, others can read and execute. Use chmod recursive for directories.
Full Access
Everyone has full permissions. Use with caution!
Private
Only owner has access. Maximum security.
Private File
Only owner can read and write.
Read/Write All
Everyone can read and write, but not execute.
About Chmod and File Permissions
The chmod command (change mode) is a fundamental tool in Linux and Unix-based operating systems used to control file and directory permissions. Our chmod value calculator helps you understand and properly configure file permissions, which is crucial for system security and proper access control.
File permissions in Linux are divided into three categories: Owner (the user who owns the file), Group (users who are members of the file's group), and Others (all other users). Each category can have three types of permissions: read (r), write (w), and execute (x).
This chmod permissions calculator makes it easy to visualize and convert between different permission notations. Whether you're a system administrator, developer, or Linux enthusiast, our chmod number calculator helps you quickly determine the correct permissions for your files and directories, including chmod recursive operations.
Special permissions like SETUID, SETGID, and the Sticky bit provide additional control over file execution and directory access. These advanced features are fully supported in our calculator.