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Subject: Re: Extra CR symbol from backticks on Cygwin 2.9.0
To: Nikolay Melekhin <nikolay DOT melekhin AT gmail DOT com>
References: <CAAq9174Ffd-zFLrCsUSz5DcxW8DYaeQbxsPxWMH0bh0vPBJCLA AT mail DOT gmail DOT com> <7ed18312-4929-8299-d186-9cb0aa541a93 AT redhat DOT com> <CAAq9174TrUGOr+y4GvMWEqNXao-zyemptuoSM8_Jna33qwpjiw AT mail DOT gmail DOT com>
Cc: cygwin AT cygwin DOT com
From: Eric Blake <eblake AT redhat DOT com>
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Date: Tue, 12 Sep 2017 08:06:30 -0500
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From: Eric Blake <eblake AT redhat DOT com>
To: Nikolay Melekhin <nikolay DOT melekhin AT gmail DOT com>
Cc: cygwin AT cygwin DOT com
Message-ID: <61150261-b3c4-d5e5-23ff-a4320a19715c AT redhat DOT com>
Subject: Re: Extra CR symbol from backticks on Cygwin 2.9.0
References: <CAAq9174Ffd-zFLrCsUSz5DcxW8DYaeQbxsPxWMH0bh0vPBJCLA AT mail DOT gmail DOT com>
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On 09/12/2017 12:38 AM, Nikolay Melekhin wrote:
> https://www.gnu.org/software/bash/manual/bash.html#Command-Substitution
>=20
> "...with any trailing newlines deleted." That is why I expected that
> bash should remove trailing newlines in command substitution results,
> which are CRLF on Windows.

No, newlines are LF.  CR are carriage returns, not newlines.

>>From my point of view, bash in Cygwin should follow the same rule on
> Linux and Windows: remove trailing newlines in command substitution.

That's exactly what it does, newlines only by default.

> So remove trailing CRLF on Windows.

CR are not newlines.  Cygwin apps don't generate CR by default, so bash
doesn't strip CR by default.

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


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