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

[Mike Frysinger]

i've been under the mistaken assumption that the -n/--no-clobber option exits
non-zero when the target exists, but someone pointed out to me recently that
it silently ignores existing files.  can we get a setting to control this ?

basically i've been writing things like:
if ! cp -n foo bar; then
  ... error out because bar already exists, or otherwise failed ...
fi

when really i need to write:
if [ -e bar ] || ! cp foo bar; then
  ... error out ...
fi
-mike

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