Chmod-Calculator.app
Easily calculate and convert chmod permissions between Numeric (e.g. 777), Symbolic (e.g. +x), and RWX notations (e.g. rw-r--r--).
Chmod Calculator
Simple Chmod Calculator with intuitive checkbox on user, group and others
Check any permission box or input any Chmod options to get instant calculation results !
User (Owner) Permissions
Group Permissions
Others (Public) Permissions
Chmod Permissions Calculation Table
| r w x | |||
|---|---|---|---|
| 4 2 1 | |||
| Decimal | Calculation | Symbolic | Description |
| 0 | 0 + 0 + 0 | - - - | none |
| 1 | 0 + 0 + 1 | - - x | execute only |
| 2 | 0 + 2 + 0 | - w - | write only |
| 3 | 0 + 2 + 1 | - w x | write and execute |
| 4 | 4 + 0 + 0 | r - - | read only |
| 5 | 4 + 0 + 1 | r - x | read and execute |
| 6 | 4 + 2 + 0 | r w - | read and write |
| 7 | 4 + 2 + 1 | r w x | read, write, and execute |
Common Chmod Options
Understanding chmod 600
chmod 600 sets permissions so that only the owner can read and write the file, while group members and others have no permissions at all. This is commonly used for files containing sensitive information that should only be accessible by the owner, such as private keys or certain configuration files. For instance, 'chmod 600 id_rsa' is often recommended for SSH private key files.