"S" mode for file permission?

[Jose I Diaz Bardales]

On 12/12/20 3:46 PM, Ralf Mardorf via ubuntu-users wrote:
> On Sat, 12 Dec 2020 15:30:59 -0500, Jose I Diaz Bardales wrote:
>> If I remember correctly s is to set the group id on a file or
>> directory in other words the file can executed on behalf of the group.
>>
>> The "s" is for directories and "S" for files.
> 
> No! Google is your friend!
> 

I knew memory will fail. Ralf is right so if the file does not havean 
execute (x) permission when you set the group id you will see an 
uppercase "S" instead of a lowercase "s"  :-)