Thanks for taking the time to report this. The behaviour you describe
may seem surprising (and it was to me, too!), but is actually what the
man page describes:
chmod preserves a directory's set-user-ID and set-group-ID bits unless
you explicitly specify otherwise. You can set or clear the bits with
symbolic modes like u+s and g-s, and you can set (but not clear) the
bits with a numeric mode.
So, you can clear the setgid bit on the directory in your example with
"chmod g-s Y", but not with "chmod 0775 Y". Since this is the defined
behaviour that others may have come to expect for both interactive use
and in long-established scripts, it's unlikely to be changed now.
** Package changed: bash (Ubuntu) => coreutils (Ubuntu)
** Changed in: coreutils (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/927218
Title:
Unable to unset setguid bit
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