bug#61105: cp/mv: want a fatal --no-clobber

[Paul Eggert]

On 2023-01-30 13:35, Pádraig Brady wrote:
> This is a good observation.
> Also the current "skip" functionality of coreutils cp -n
> is already catered for with the --update option.

For consistency, there too the exit status should reflect whether the cp 
action was done.

I installed the attached patch to implement this; comments welcome. In 
the meantime I'm boldly closing the bug report.

0001-cp-ln-mv-when-skipping-exit-with-nonzero-status.patch
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