Symbolic Notation
-rw-rw----(as shown by ls -l)-rw-rw----
typeownergroupother
Permission Matrix
| Read(4) | Write(2) | Execute(1) | Octal | |
|---|---|---|---|---|
| Owner | r | w | - | 6 |
| Group | r | w | - | 6 |
| Other | - | - | - | 0 |
What Does chmod 660 Mean?
Owner can read, write. Group can read, write. Others can no access.
$ chmod 660 filenameCommon Use Cases
Owner and group can read and write; others have no access. Used for shared project files within a team.
Security Notes
Secure for team-shared sensitive files. Verify the group membership is correct — anyone in the group has full read/write access.
Interactive Tool
Need to calculate a custom permission? Use the interactive permissions calculator to toggle individual bits and get instant results.
Unix Permissions Calculator