Well, it says here that you should be able to remove a special permission using:
chmod 0770 example
This isn't true. One should use:
# in simbolic
chmod g-s example
# or, in octal
chmod 00770 example
chmod =770 example
Hello @RenichBon !
Thank you for reporting this to us.
You are right about removing the special permissions from directories require extra leading 0 : man chmod :
I will flag this with our course development team.
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