>
> >> can anyone show me a bash test to put before mv that will tell whether
> >> mv will do a simple rename or a copy and delete? for example for mv
> >> into a --bind mount, df reports both locations as within the same fs,
> >> yet mv will copy and delete. the best test I can think of would create
> >> a file, mv and see what happens. can anyone concoct an accurate test
> >> that doesn't need to create a test file? (or perhaps reveal an mv
> >> alternative..)
>
> Suppose you are moving FILENAME to DIR. I think you want to do both:
>
> stat -c %d FILENAME
> stat -c %d DIR/
>
> Note the slash at the end of DIR/. If DIR is a symlink to a mounted
> device then these will give different answers and you only want the second
> of the two answers:
>
> stat -c %d DIR
> stat -c %d DIR/
> ...
> So I think this is the kind of thing you want to do:
>
> FILENAME="$1"
> DIRNAME="$2"
>
> if [ $(stat -c %d "$FILENAME") == $(stat -c %d "${DIRNAME}/") ] ; then
> echo RENAME
> else
> echo COPY/DELETE
> fi
>
thanks.. but for me they all show the same device whether inside or outside
a --bind, unfortunately that doesn't provide a clue that mv across the mount
boundary will copy&delete instead of rename..
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