Special Permissions
| Special Permissions | on a File | on a Directory |
|---|---|---|
| SUID or Set User ID | A program is executed with the file owner's permissions (rather than with the permissions of the user who executes it). | Files created in the directory inherit its UID. |
| SGID or Set Group ID | The effective group of an executing program is the file owner group. | Files created in the directory inherit its GID. |
| Sticky (bit) | A program sticks in memory after execution. | Any user can create files, but only the owner of a file can delete it. |
| Permissions | Meaning |
|---|---|
--S------ | SUID is set, but user (owner) execute is not set. |
--s------ | SUID and user execute are both set. |
-----S--- | SGID is set, but group execute is not set. |
-----s--- | SGID and group execute are both set. |
--------T | Sticky bit is set, bot other execute is not set. |
--------t | Sticky bit and other execute are both set. |
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