GNU bug report logs - #8796
I need help piping csplit

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Julio Cesar Gonzalez Torres <bettlebog <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: I need help piping csplit
Date: Fri, 3 Jun 2011 14:46:26 -0500

[Message part 1 (text/plain, inline)]

Hi I have an issue, I'm trying to split several files into two the first one
is the head of file and the next one has to start with some title, but
csplit don't allowe me to piping, this is how i'm doing

$> find ./ -name '*out' | xargs csplit '/All Frequencies/' '/Statistical/'

I have to now all the locations of files that ends with "out", next every
time the command finds a file I want to csplited but terminal sends me an
error:

csplit: cannot be open «/Statistical/» to read: file or extension don't
exist--
*
*_¬\_           ___________________________
 (  ¬¸>        || Julio César González Torres||
  |   \ »──   || UAM-Azcapotzalco  FAMA   ||
  | V()         ─────────────────────
  L  //
   |_ |_*
*

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Message #10 received at 8796-done <at> debbugs.gnu.org (full text, mbox):

From: Eric Blake <eblake <at> redhat.com>
To: Julio Cesar Gonzalez Torres <bettlebog <at> gmail.com>
Cc: 8796-done <at> debbugs.gnu.org
Subject: Re: bug#8796: I need help piping csplit
Date: Fri, 03 Jun 2011 15:44:04 -0600

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tag 8796 notabug
close 8796
thanks

On 06/03/2011 01:46 PM, Julio Cesar Gonzalez Torres wrote:
> Hi I have an issue, I'm trying to split several files into two the first one
> is the head of file and the next one has to start with some title, but
> csplit don't allowe me to piping, this is how i'm doing
> 
> $> find ./ -name '*out' | xargs csplit '/All Frequencies/' '/Statistical/'
> 
> I have to now all the locations of files that ends with "out", next every
> time the command finds a file I want to csplited but terminal sends me an
> error:
> 
> csplit: cannot be open «/Statistical/» to read: file or extension don't
> exist--

Thanks for the report.  However, this is not a bug in coreutils, but in
your usage of xargs.  So I'm marking it closed.

It helps to insert 'echo' prior to 'csplit' to see what you are calling:

csplit '/All Frequencies/' '/Statistical/' file1out file2out ...out

But csplit is documented as requiring a single file name, followed by
multiple patterns.

What you WANT to do is:

find . -name '*out' | \
  xargs -I{} csplit {} '/All Frequencies/' '/Statistical'/

The use of -I{} forces xargs to use one file per csplit invocation
(instead of cramming in as many files as possible), as well as to let
you choose where to substitute the file name 9rather than cramming it on
as the last argument).

-- 
Eric Blake   eblake <at> redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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Message #13 received at 8796 <at> debbugs.gnu.org (full text, mbox):

From: Eric Blake <eblake <at> redhat.com>
To: 8796 <at> debbugs.gnu.org
Subject: Re: bug#8796: I need help piping csplit
Date: Fri, 03 Jun 2011 16:27:59 -0600

[Message part 1 (text/plain, inline)]

On 06/03/2011 03:44 PM, Eric Blake wrote:
> But csplit is documented as requiring a single file name, followed by
> multiple patterns.
> 
> What you WANT to do is:
> 
> find . -name '*out' | \
>   xargs -I{} csplit {} '/All Frequencies/' '/Statistical'/

Or, ditch xargs altogether, and do it all through find:

find . -name '*out' -exec csplit {} "/All Frequencies/" /Statistical/ \;

which has the added benefit of avoiding problems with any *out files
that have embedded newlines.

-- 
Eric Blake   eblake <at> redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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