?Describe the SGID special permission, and provide an example of where this permission might be used.

What will be an ideal response?

The SGID allows regular users to execute a binary compiled program and become a member of the group that is attached to the file. Thus, if a file ?is owned by the group "sys" and also has the SGID permission, any user who executes that file will be a member of the group "sys" during execution. If a command or file requires the user executing it to have the same permissions applied to the sys group, setting the SGID on the file simplifies assigning rights to the file for user execution. Additionally, if a user creates a file in a directory that has the SGID permission
set, that user's name becomes the owner of the file and the directory's group becomes the group owner of the file.