From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-return-42530-mason-zsh=primenet.com.au@zsh.org>
Received: (qmail 15686 invoked by alias); 25 Mar 2018 08:26:26 -0000
Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm
Precedence: bulk
X-No-Archive: yes
List-Id: Zsh Workers List <zsh-workers.zsh.org>
List-Post: <mailto:zsh-workers@zsh.org>
List-Help: <mailto:zsh-workers-help@zsh.org>
List-Unsubscribe: <mailto:zsh-workers-unsubscribe@zsh.org>
X-Seq: 42530
Received: (qmail 12121 invoked by uid 1010); 25 Mar 2018 08:26:26 -0000
X-Qmail-Scanner-Diagnostics: from mail-wr0-f169.google.com by f.primenet.com.au (envelope-from <stephane.chazelas@gmail.com>, uid 7791) with qmail-scanner-2.11 
 (clamdscan: 0.99.2/21882. spamassassin: 3.4.1.  
 Clear:RC:0(209.85.128.169):SA:0(-1.9/5.0):. 
 Processed in 3.828421 secs); 25 Mar 2018 08:26:26 -0000
X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on f.primenet.com.au
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM,
	RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_PASS,T_DKIM_INVALID autolearn=ham
	autolearn_force=no version=3.4.1
X-Envelope-From: stephane.chazelas@gmail.com
X-Qmail-Scanner-Mime-Attachments: |
X-Qmail-Scanner-Zip-Files: |
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20161025;
        h=date:from:to:subject:message-id:mail-followup-to:references
         :mime-version:content-disposition:in-reply-to:user-agent;
        bh=MSCgKnayY+gpQNaWMwvvRaHbSTbyo2HPbRBHHBSEuK0=;
        b=o60zT6DGmVr4lvLnidUzgi0c8W3kHVVkGCSpKtikBUkPuIvIBNjxV26PvcPKKahxlY
         Umci9wgwwlYksU0RtSwxojZD6WwpxIFikdw4L2NXpX6b6x9aOQT/8TTDk7OAOvdg6KgZ
         9F2K+eDqRsHntAAv5hbELR+T2GLB522XtKEgxxNAwLb4dPXvo2FcCXrUVgryMpdzbWNU
         zZhfA3HX4oyaSOYGoPcXGEuos7hIOph5F/WZcRe9ztfoR8XoNChCX8/pAkaGotLzyehL
         neQc8uDROj6/nbKsn8busdskvR7i8cAyUEwyI5hkcdRNTEeZh3m4ZJn559CHauhvHGKp
         mYTA==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:date:from:to:subject:message-id:mail-followup-to
         :references:mime-version:content-disposition:in-reply-to:user-agent;
        bh=MSCgKnayY+gpQNaWMwvvRaHbSTbyo2HPbRBHHBSEuK0=;
        b=qnFJeMTGrC5jilv4Cr7T/AkGEWkKPXAMSAYo52LRJtQoiPY8tDVDcj3VmODzeVL/9y
         3r/zoMaCjjFwtHxcAsnqfxrym2mXA8WLbPOhaoqj9x66cqaUYL4uxHm/epuaUfAcp6UZ
         JyOjhCZibLLosISqbBN1lZs7NdZgRKZQDdBuvS92qJA4iZ3BQ+08GmicOUNdfuC9YydO
         3yTz4wh6DkJwzJjLIrAyC1GJUbxOI676kU/wU9MxqVXRWZbPlRakn0oQxwJdCdLZ1rYS
         qXELXIAZSxNtUwS71urlsWmzHNo5UB9hKnOfG92CVt79DTOMOj0OEPmz/asQZurE+oun
         VgDg==
X-Gm-Message-State: AElRT7H9XGcDxI4zHa/lKtMGRaC9eDlQwFNtut95NfwzchgjHVVqrEMH
	q+9uYDIcR4L2KJ66qu2F5zDr6w==
X-Google-Smtp-Source: AG47ELsE/hauqr95Sqyw172WR2tMEsEO9QQzFFlx+b5OkR+jMZImuXEVj0Zp8AWeCiXq1RrhQUgLKg==
X-Received: by 10.223.225.133 with SMTP id k5mr12660673wri.263.1521966379369;
        Sun, 25 Mar 2018 01:26:19 -0700 (PDT)
Date: Sun, 25 Mar 2018 09:26:17 +0100
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Bart Schaefer <schaefer@brasslantern.com>,
	Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: "echo | ps -j $(:) | cat | cat | cat" runs components in
 different process groups
Message-ID: <20180325082617.GC7561@chaz.gmail.com>
Mail-Followup-To: Bart Schaefer <schaefer@brasslantern.com>,
	Zsh hackers list <zsh-workers@zsh.org>
References: <20180323161612.GB4857@chaz.gmail.com>
 <180323163614.ZM10192@torch.brasslantern.com>
 <180323221959.ZM27569@torch.brasslantern.com>
 <20180324080514.txxyrb3qiztu4pqt@gmail.com>
 <20180324173406.GA18604@chaz.gmail.com>
 <180324152357.ZM32580@torch.brasslantern.com>
 <20180325070053.GB5782@chaz.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20180325070053.GB5782@chaz.gmail.com>
User-Agent: Mutt/1.5.24 (2015-08-30)

2018-03-25 08:00:53 +0100, Stephane Chazelas:
[...]
> That also causes some surprises like in 
[...]
> Or (though some would find the zsh behaviour less surprising):
> 
> $ n=1; echo $((++n)) >&2 | echo $((++n)) >&2 | echo $n
> 2
> 3
> 3
[...]

Or:

$ true; true | true $(false) | echo $?
1
$ false; echo $(:) | echo $?
0

-- 
Stephane