Configure Special File Permissions

Name: sticky bit, 1, t
Users can only delete files when they are owner, or when they are root or owner of the directory. This is usually applied to be /tmp directory.

Name: SGID (Set GroupID), 2, s
When a program is run, this sets the group ID of the process to that of the group of the file. Files created in this directory belong to the group to which the directory belongs and not the primary group of the users. New directories created in this directories inherit the SGID bit.

Name: SUID (Set UserID), 4, s
Sets the user ID of the process to that of the owner of the file when the program is run.