X-Recipient: archive-cygwin AT delorie DOT com
DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:cc:subject:message-id:in-reply-to
	:references:mime-version:content-type:content-transfer-encoding;
	 q=dns; s=default; b=DCN1+HyFOT9cCHzcqoD3DGIzy2Oc4PEF46PLpkIXqYe
	ry8i27VY4FnSwy/nl2BQjt5DnXxzWDvMbTTI6JWyjOblG2Mb4YrfojvYoFHKVFmP
	Qn2amJvrYRRWT3GyuUGEEpdEKt0G9AbwwfNFKLO0iRfC46Pguc0sQQ2rilOegz0I
	=
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:cc:subject:message-id:in-reply-to
	:references:mime-version:content-type:content-transfer-encoding;
	 s=default; bh=686wYkNI3iM6soS63VmYZSd5N1U=; b=mQgjIRGoTNZRXvaes
	dJUkGl5ChvW2VoxDXpsGPPVTYGpM94ale6f3od0/bvwnqystkJe6Uwb7b8jM9u1+
	gxhVcVkNqOepZics/Dq/QDHxnfcjBCC/jw9LIeYsmlAE714CyPkISoxW6jx9nnfG
	bW1vFIPsJq/Xvovz+LvxmvJc84=
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Authentication-Results: sourceware.org; auth=none
X-Spam-SWARE-Status: No, score=-7.6 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 spammy=Haubenwallner, haubenwallner, HX-Languages-Length:965, H*r:authenticated
X-HELO: conssluserg-06.nifty.com
DKIM-Filter: OpenDKIM Filter v2.10.3 conssluserg-06.nifty.com x9B9OdoF005437
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.ne.jp;	s=dec2015msa; t=1570785880;	bh=IL5SvpfP83FymdTJeQk6AqRRgbEfQXVmrTB6BmKd0h4=;	h=Date:From:To:Cc:Subject:In-Reply-To:References:From;	b=YOVi2Vxr5JtjDyThDnE9M5cCHm4v3Fl1zZE6zOKGrJuaTthit4joOKpbLN9+pursQ	 FhndRck1z22BvNfqxZ1SWeCNp/drxap4jqjD2YwbX6Kaap2es3OifmlO8XCHHpip48	 BnBpg7wnrq62anwT4Vj9McuuZP/PvH43ViXEJFOjJmZ4wgy47oWde8NfLz9s44RTdY	 b32DPS+GkpPazWZXB/WIbjqxJycz86KnDlLpdjizW+GVfkhYxkGrGCGQvX6bIQlwTw	 PRUt5ea7paesH/NZPPx2HXn9gDcZHnE5AEJEoVvz9BlSK2tDzHSXEowkLEemgXp1/N	 g+mrXjOGhtWPQ==
Date: Fri, 11 Oct 2019 18:24:39 +0900
From: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
To: cygwin AT cygwin DOT com
Cc: Michael Haubenwallner <michael DOT haubenwallner AT ssi-schaefer DOT com>
Subject: Re: [ANNOUNCEMENT] cygwin 3.1.0-0.6 (TEST)
Message-Id: <20191011182439.6dd3fedb2c7138627e53c053@nifty.ne.jp>
In-Reply-To: <aa4429ee-a974-5888-f602-d2e686f8cc2b@ssi-schaefer.com>
References: <announce DOT 20190922101035 DOT 2703-1-kbrown AT cornell DOT edu>	<aa4429ee-a974-5888-f602-d2e686f8cc2b AT ssi-schaefer DOT com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes

Hi Michael,

On Thu, 10 Oct 2019 12:43:56 +0200
Michael Haubenwallner wrote:
> I'm encountering another strange behaviour I do not remember to have seen before:
> 
> Using ssh from some Linux xterm into the Cygwin sshd running on Server 2019
> does clear the current terminal content as if /usr/bin/clear was executed.

This is intentional behaviour.

The pseudo console has its own screen buffer behind, and redraws
the screen based on the screen buffer at undetermined timing.
The screen buffer is empty at the beginning, so the screen should
be cleared at the opening of the pty so that the real screen and
the screen buffer are synchronozed.

The clear screen is prevented when TERM=dumb, so you can see what
happens if clear screen is not done by following steps.

1)  Execute ls or ps to draw something to screen.
2) env TERM=dumb ssh <cygwin-hostname>
3) Execute cmd.exe.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple