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From: "Eli Zaretskii" <eliz@is.elta.co.il>
Newsgroups: gmane.emacs.bugs
Subject: Re: Latin1 language environment breaks Cygwin shell buffer
Date: Sat, 06 Apr 2002 21:39:33 +0300
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> From: Jason Rumney <jasonr@gnu.org>
> Date: 06 Apr 2002 18:43:03 +0100
> 
> "Eli Zaretskii" <eliz@is.elta.co.il> writes:
> 
> > I suspect that the problem is with the EOL conversion in process I/O:
> > where w32-fns.el carefully sets up the EOL conversions as apropriate
> > for both input and output, the language environment leaves the EOL
> > conversion undecided.
> 
> It only leaves the EOL conversion undecided when moving from
> "Default" to "Latin-1", which is the case that works. In the case
> of moving from "German" to "Latin-1", it sets both to iso-latin-1-dos.

I see in w32-fns that it sometimes sets the encode part of
default-process-coding-system to *-unix.  Wasn't the problem in the
OP's case the DOS encoding of command lines sent to the shell?