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Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182 )
From: |
Kamil Dudka |
Subject: |
Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182 ) |
Date: |
Tue, 6 Jan 2009 12:29:22 +0100 |
User-agent: |
KMail/1.9.6 (enterprise 0.20071012.724442) |
Thanks for review.
On Tuesday 23 December 2008 01:37:54 Pádraig Brady wrote:
> For my own reference this is how I now see
> the overwrite characteristics of cp & mv:
>
> cp : default overwrite method = truncate only (file must be writable)
> -f overwrite method = truncate falling back to unlink+create
> (redundant if the -n option is used)
> --remove-destination
> overwrite method = unlink+create
> (redundant if the -n option is used)
Should I mention this in documentation and/or help?
> -i prompt before trying to overwrite dest
> (overrides any preceeding -n option)
> -n never overwrite
> (overrides any preceeding -i option)
>
> mv : prompt to overwrite if dest not writable
> -f never prompt before overwriting
> (overrides any preceeding -i or -n options)
> -i always prompt before overwriting
> (overrides any preceeding -f or -n options)
> -n never overwrite
> (overrides any preceeding -f or -i options)
So in the case of mv there is no violation with FreeBSD implementation, nor
POSIX.
> p.s. According to the FreeBSD manpages referenced in this thread,
> cp -f in FreeBSD doesn't conform to POSIX, and instead
> means as I originally thought: "try best to overwrite _and don't prompt_."
> I.E. it overrides any preceeding -i or -n options.
Yes, the behavior of FreeBSD cp -f option differs from POSIX and this patch.
Up to date version of the patch is attached.
Kamil
0001-cp-mv-add-n-option-to-not-overwrite-target.patch
Description: Text Data
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182 ),
Kamil Dudka <=
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Pádraig Brady, 2009/01/06
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Kamil Dudka, 2009/01/06
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Kamil Dudka, 2009/01/06
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Jim Meyering, 2009/01/07
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Kamil Dudka, 2009/01/07
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Jim Meyering, 2009/01/07
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Kamil Dudka, 2009/01/07
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Jim Meyering, 2009/01/07
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Eric Blake, 2009/01/07
- Re: cp/mv: add -n option to not overwrite target (Ubuntu bug #229182), Jim Meyering, 2009/01/08