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Number   :  135
Date     :  2001-06-03
Author   :  Kan Yabumoto
Subject  :  Re: Prompt before file copy
Size(KB) :  2


At 2001-06-03 08:50, Melissa wrote:
> from David:
> > >How can I get a prompt before creating (not overwriting) each
> > >destination file? Using /P does not seem to work. I'm sure I've
> > >missed something basic.
> from Kan:
> > Now, as David pointed out, /P is not specific to file creation.
> > Currently, XXCOPY has the following switches
> >
> > /P // prompts at any file action (for create and overwrite)
> > /Y0 // prompts when a file is to be overwritten
> >
> > Indeed, the prompt prior a file-creation is missing...
> >
> > ==================================================================
> > So, what we need is a new set of prompts like...
> >
> > /PC // prompts before file-creation
> > /Po // prompts before file-overwriting (equivalent to /Y0)
>
>So, the only difference between the existing switch and the proposed
>switch is that the latter would not appear when an overwrite comes
>up. I must have misinterpreted David's message, because it sounded
>as if no prompt came up for new files, even with the /P switch.
>(Since most of my xxcopy activity is in batch files, I try to
>suppress all prompts, all the time.)
>
>Melissa
=======================================================================

Well, /P can be possibly suppressed by /YY, and therefore,
I did not comment on it one way or the other.

What I was saying was that /P does not distinguish whether the
file action is for file-creation or file-overwriting (for file
write activities, of course). Even the /P action can be
suppressed in other context (e.g., /L will make /P a
moot point and therefore /P is suppressed by /L).

Although we could "couple" actions for overwrite and file-creation,
usually, when a switch like this is created, it's usually most
convenient if the two operate independently one another. So,
/PC (and it's counter-switch, /PC0) or /Po (and /Po0 --- which
are the same as /Y0 and /Y) should not modify the behavior
of the other one.

Summing this up,

/PC controls the aspect of file-creation only (has no effect
when a file is overwritten.

/Po controls the aspect of file-overwriting (has no effect on
when a file is created (that's how the /Y switch currently
works and there is no reason to let /Po behave any
differently).

Wow, we are now discussing a vapor switch in great detail.
(we wish we always engage in a detailed discussion of a how a
new switch should behave before it has been implemented ----
in some rare cases, we end up regretting our earlier decisions).

Hope this should make it clear.

Kan Yabumoto

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