Chmod Calculator
The Chmod Calculator translates between symbolic notation like rwxr-xr-- and the numeric 754 form. Toggle bits for owner, group and others to build a safe permission set.
Key Features
- Symbolic and octal views
- Per-role read, write, execute
- Special bits (setuid, setgid, sticky)
- Common presets
- Local only
Use Cases
- Set a web file to 644
- Make a script executable
- Lock down a private key
- Teach Unix permissions
How to Use
- Toggle the bits for each role
- Read the octal value
- Apply with chmod
Practical Tips
- 755 for executables, 644 for files
- 700 keeps a directory private
- Avoid 777 unless you mean it
FAQ
- What is 644?
- Owner read/write, everyone else read only.
- Sticky bit?
- Keeps users from deleting others files in a shared dir.