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Re: [PATCH] status=noinfo option for dd

From: Pozsar Balazs
Subject: Re: [PATCH] status=noinfo option for dd
Date: Fri, 19 Feb 2010 22:46:56 +0100
User-agent: Mutt/1.5.18 (2008-05-17)

On Fri, Feb 19, 2010 at 10:31:26AM +0100, Ondřej Vašík wrote:
> Hi,
> Pozsar Balazs wrote:
> > New (hopefully better) version of the patch.
> > 
> > dd: status=noinfo operand suppresses the transfer count information
> > when the program exits.
> I think that option does not follow POSIX. 

Yes, this would been an extension. What's the problem with that?
Why would we limited by the features standardized by posix?

> Similar thing was requested this week at 
> https://bugzilla.redhat.com/show_bug.cgi?id=566079 , I suggested some
> wrapper script to achieve this.

What I want is: do not print out record count etc, but do print out 
errors if there were. You cannot do that with wrapper scripts in any 
sane way.

> dd POSIX says:
> "
> On completion, dd shall write the number of input and output blocks to
> standard error. In the POSIX locale the following formats shall be used:
> ...
> In addition, when there is at least one truncated block, the number of
> truncated blocks shall be written to standard error. In the POSIX
> locale, the format shall be:
> "
> With this option, it will not output POSIX-required informations on
> stderr on completition and therefore it should not be possible to
> supress those informations (at least with POSIXLY_CORRECT but doing
> additionally this hack looks silly to me)

This argument is nonsense. If I choose that dd should not behave posixly 
correct, then SURPRISE, it wont behave posixly correct and will suppress 
those lines.
Please don't tell me that a check for POSIXLY_CORRECT should be added so 
if I pass both POSIXLY_CORRECT=1 and status=noinfo (oh what a fun!) it 
should give me an error about bad options...


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