I think you may be getting too deep into the detail.
Think of the bigger picture:
when I move a file, I don't expect that to change its ownership or
permissions - it would surprise me if it did;
when I make a copy of a file, I expect to own the copy - after all, what use
is a private copy I
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Jonathan McKeown wrote:
The bit that still worries me in this discussion is the sgid bit (pun not
intended, but I'm not going to delete it now!): as I understand it, creating
a file has different behaviour on SYSV-derived systems and
