Chmod 740 Explained
Chmod 740: owner full access, group read-only, others no access. For executables where the group needs to inspect but not run.
Permission
740
rwxr-----
chmod 740 filename
Permission Breakdown
| Role | Read (4) | Write (2) | Execute (1) | Octal | Meaning |
|---|---|---|---|---|---|
| Owner | r | w | x | 7 | read, write, execute |
| Group | r | - | - | 4 | read |
| Others | - | - | - | 0 | no permissions |
Visual Permission Grid
Detailed Explanation
The permission 740 gives the owner full access, the group read-only access, and blocks others entirely.
Octal breakdown:
- 7 (Owner): read (4) + write (2) + execute (1) = full access
- 4 (Group): read (4) only
- 0 (Others): no access
In symbolic notation this is rwxr-----. The owner can read, write, and execute. Group members can only read the file. Others cannot access it at all.
This is useful for scripts or programs where group members need to review the source code (for auditing or learning) but should not execute them directly. It provides a clear separation of roles: the owner runs the program, group members review it, and everyone else is excluded.
Use Case
Used for internal scripts where team members need to review code for auditing or knowledge sharing, but only the owner/administrator should execute them.