Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182)

[Eric Blake]

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According to Pádraig Brady on 12/22/2008 2:54 AM:
>> +  -f, --force                  do not prompt before overwriting  (The -f 
>> option\n\
>> +                                 overrides any previous -i or -n 
>> options.)\n\
>> +  -i, --interactive            prompt before overwrite  (The -i option\n\
>> +                                 overrides any previous -f or -n 
>> options.)\n\
>> +  -n, --no-replace             do not overwrite an existing file  (The -n\n\
>> +                                 option overrides any previous -f or -i\n\
>> +                                 options.)\n\
> 
> This is actually now quite confusing/inaccurate. I think these 3 options
> should be mutually exclusive. I.E. if more than 1 specified an
> error should be printed.

POSIX requires support for simultaneous -f and -i, in either order, so we
can't error out there.  But since -n is an addition, we can error out
depending on -f or -i, if that makes more sense than overriding.

Again, since we are modeling after the fact that FreeBSD provides it, what
is the behavior on that platform when you mix-n-match -fin?

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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