GNU bug report logs - #14846
doc: dd: improve ibs=BYTES description

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Package: coreutils; Severity: wishlist; Reported by: jidanni@HIDDEN; Keywords: notabug; dated Fri, 12 Jul 2013 03:42:02 UTC; Maintainer for coreutils is bug-coreutils@HIDDEN.
Changed bug title to 'doc: dd: improve ibs=BYTES description' from 'dd how to skip one byte from reading the man page' Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Severity set to 'wishlist' from 'normal' Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) notabug. Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#14846: dd how to skip one byte from reading the man page
References: <877ggwr6zg.fsf@HIDDEN> <51E033B6.8090508@HIDDEN>
From: Assaf Gordon <assafgordon@HIDDEN>
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 Content preview:  tags 14846 notabug severity 14846 wishlist retitle 14846 doc:
    dd: improve ibs=BYTES description stop (triaging old bugs) On 12/07/13 10:49
    AM, Pádraig Brady wrote: > On 07/12/2013 12:50 AM, >> >> it seems >> ibs=BYTES
    >> read up to BYTES bytes at a time (default: 512) >> should be instead >>
    ibs=BYTES >> reset the input block size (default: 512) >> or something...
    > > Hmm I suppose a more direct description is more accurate. > [...] 
 
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tags 14846 notabug
severity 14846 wishlist
retitle 14846 doc: dd: improve ibs=BYTES description
stop

(triaging old bugs)

On 12/07/13 10:49 AM, Pádraig Brady wrote:
> On 07/12/2013 12:50 AM, jidanni@HIDDEN wrote:
>>
>> it seems
>>         ibs=BYTES
>>                read up to BYTES bytes at a time (default: 512)
>> should be instead
>>         ibs=BYTES
>>                reset the input block size (default: 512)
>> or something...
> 
> Hmm I suppose a more direct description is more accurate.
> 

Marking as "wishlist".

Patches welcomed.


-assaf
Information forwarded to bug-coreutils@HIDDEN:
bug#14846; Package coreutils. Full text available.

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To: jidanni@HIDDEN
Subject: Re: bug#14846: dd how to skip one byte from reading the man page
References: <877ggwr6zg.fsf@HIDDEN>
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On 07/12/2013 12:50 AM, jidanni@HIDDEN wrote:
> If the user tries to figure out how to skip one byte
> just from reading the dd man page, and not info,
> 
> in order to finally figure out how to do
> 
> $ echo abc|dd ibs=1 skip=1
> bc
> 
> it seems
>        ibs=BYTES
>               read up to BYTES bytes at a time (default: 512)
> should be instead
>        ibs=BYTES
>               reset the input block size (default: 512)
> or something...

Hmm I suppose a more direct description is more accurate.


BTW, note the skip_bytes flag which can be used to more
efficiently skip odd sizes:

$ echo abc | dd iflag=skip_bytes skip=1 status=none
bc

$ echo abc | strace -e read dd iflag=skip_bytes skip=1 status=none
read(0, "a", 1)                         = 1
read(0, "bc\n", 512)                    = 3
read(0, "", 512)                        = 0
bc

cheers,
Pádraig.
Information forwarded to bug-coreutils@HIDDEN:
bug#14846; Package coreutils. Full text available.

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Subject: dd how to skip one byte from reading the man page
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If the user tries to figure out how to skip one byte
just from reading the dd man page, and not info,

in order to finally figure out how to do

$ echo abc|dd ibs=1 skip=1
bc

it seems
       ibs=BYTES
              read up to BYTES bytes at a time (default: 512)
should be instead
       ibs=BYTES
              reset the input block size (default: 512)
or something...
Acknowledgement sent to jidanni@HIDDEN:
New bug report received and forwarded. Copy sent to bug-coreutils@HIDDEN. Full text available.
Report forwarded to bug-coreutils@HIDDEN:
bug#14846; Package coreutils. Full text available.
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