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RE: echo "$(echo '\r')" oddity
- From: Jan Just Keijser <jan dot just dot keijser at logicacmg dot com>
- To: "'cygwin at cygwin dot com'" <cygwin at cygwin dot com>
- Date: Tue, 3 May 2005 17:33:06 +0200
- Subject: RE: echo "$(echo '\r')" oddity
Hi,
thx for the quick answer. Lemme guess: I am going to have to build my own
version of bash that does not have this behaviour... what is going to break
if I undo this patch from the bash source code?
It's a shame though, coz this seems to be the only issue that stops that
nifty socat from working... all tests pass except those tests that use `` or
$() ...
Thx,
JJ
> -----Original Message-----
> From: cygwin-owner@cygwin.com
> [mailto:cygwin-owner@cygwin.com]On Behalf
> Of Brian Dessent
> Sent: Tuesday, May 03, 2005 17:31
> To: 'cygwin@cygwin.com'
> Subject: Re: echo "$(echo '\r')" oddity
>
>
> Jan Just Keijser wrote:
>
> > I have just run into a Cygwin vs Linux oddity that I cannot
> explain. I've
> > managed to trace the problem back to a very simple statement:
> > echo "$(echo -e '\r')" | od -x
> > on my W2K Cygwin install (Cygwin1.dll 2005/04/01), this produces
> > 0000000 000a
> > 0000001
> > On Linux, this command produces:
> > # echo "$(echo -e '\r')" | od -x
> > 0000000 0a0d
> > 0000002
> > (which is what I'd expect).
> > Also, the Cygwin command
> > echo -e '\r' | od -x
> > also returns
> > 0000000 0a0d
> > 0000002
>
> It appears that bash's handling of `` and $() is hardwired to
> do \r\n ->
> \n translation. I am not sure but that may be one of those
> patches that
> was added to bash that makes more things work than it breaks.
>
> ... *checks* ...
>
> Yes indeed:
>
> subst.c, function read_comsub() (which implements command
> substitution)
>
> #ifdef __CYGWIN__
> setmode (fd, O_TEXT); /* we don't want CR/LF, we want
> Unix-style */
> #endif
>
> Brian
>
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