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Subject:	Re: gawk 4.1.4: CR separate char for CRLF files
To:	cygwin AT cygwin DOT com
References:	<004401d3109c$2dcb09e0$89611da0$@gmx.net> <598a47fc DOT 5501ca0a DOT 5476f DOT 0305 AT mx DOT google DOT com> <004701d310a9$372363e0$a56a2ba0$@gmx.net> <DB6PR0601MB2085E2D695EB6D60B09FE77BBA8B0 AT DB6PR0601MB2085 DOT eurprd06 DOT prod DOT outlook DOT com> <001001d310ea$ceeee230$6ccca690$@gmx.net>
From:	Eric Blake <eblake AT redhat DOT com>
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Date:	Wed, 9 Aug 2017 06:03:33 -0500
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From: Eric Blake <eblake AT redhat DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <391b0ca2-e495-a908-160a-6d95492f526f AT redhat DOT com>
Subject: Re: gawk 4.1.4: CR separate char for CRLF files
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On 08/09/2017 03:37 AM, Jannick wrote:

> Which is a pretty much of a pain when there is no easy fallback solution
> provided in case a major change is applied. E.g. for sed - if I understand
> the reference to sed in https://cygwin.com/ml/cygwin/2017-08/msg00033.html
> correctly - a separate switch '-b' is added.

Incorrect. 'sed -b' has always existed, but did NOT do what you wanted
(it forced CR to be treated as a separate character; where what you want
is to ignore CR if it appears before LF).  In fact, the coordinated
change made back in February to all of grep, sed, and awk, was that all
three programs now default to what used to be possible only through 'sed
-b', because silently stripping CR can corrupt data when you are not
expecting it, while requiring the user to explicitly strip CR when they
know they are working with CRLF line endings is less magic (fewer
downstream patches, and more obvious in looking at a script that the
script knows what it is doing).

If your data lives on a text mount (instead of a binary mount), then you
still get CR stripping for free.  If your data comes from a pipeline
rather than the file system, then you can add a d2u or other
CR-stripping tool in the pipeline.


> This is - to say the least - unpleasant in the light of what Cygwin claims
> to be, namely 'a large collection of GNU and Open Source tools which prov=
ide
> functionality similar to a Linux distribution on Windows' (from the top of
> the start website www.cygwin.com).

On Linux, nothing strips CR automatically.  So on Cygwin, we behave the
same - nothing strips CR automatically on binary mounted data.

And the fact that the change was made AND ANNOUNCED back in February,
but you are now only 6 months later complaining about it, is telling.

--=20
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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