Here are some common file permission settings in numeric notation along with their meanings:
-
644:
- Owner: Read (4) + Write (2) = 6
- Group: Read (4) = 4
- Others: Read (4) = 4
- Meaning: The owner can read and write the file, while the group and others can only read it. Commonly used for files like configuration files.
-
600:
- Owner: Read (4) + Write (2) = 6
- Group: No permissions = 0
- Others: No permissions = 0
- Meaning: The owner can read and write the file, while no one else has any access. Often used for sensitive files, such as private keys.
-
700:
- Owner: Read (4) + Write (2) + Execute (1) = 7
- Group: No permissions = 0
- Others: No permissions = 0
- Meaning: The owner has full access, while no one else can access the file. Used for scripts or files that should be private.
-
755:
- Owner: Read (4) + Write (2) + Execute (1) = 7
- Group: Read (4) + Execute (1) = 5
- Others: Read (4) + Execute (1) = 5
- Meaning: The owner can read, write, and execute the file, while the group and others can read and execute it. Common for executable scripts and programs.
-
777:
- Owner: Read (4) + Write (2) + Execute (1) = 7
- Group: Read (4) + Write (2) + Execute (1) = 7
- Others: Read (4) + Write (2) + Execute (1) = 7
- Meaning: Everyone has full access to the file (read, write, execute). This setting is generally discouraged due to security risks.
These permission settings help control access to files and directories, ensuring that only authorized users can perform specific actions.
