From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-request@math.gatech.edu>
Received: (qmail 26528 invoked from network); 3 May 1998 02:13:38 -0000
Received: from math.gatech.edu (list@130.207.146.50)
  by ns1.primenet.com.au with SMTP; 3 May 1998 02:13:38 -0000
Received: (from list@localhost)
	by math.gatech.edu (8.8.5/8.8.5) id WAA04930;
	Sat, 2 May 1998 22:10:11 -0400 (EDT)
Resent-Date: Sat, 2 May 1998 22:08:36 -0400 (EDT)
From: "Bart Schaefer" <schaefer@brasslantern.com>
Message-Id: <980502190831.ZM29269@candle.brasslantern.com>
Date: Sat, 2 May 1998 19:08:31 -0700
In-Reply-To: <199805022224.QAA03113@ipecac.Central.Sun.COM>
Comments: In reply to talley@boulder.Central.Sun.COM (Steve Talley)
        "exit value of intermediate program in pipe" (May  2,  4:24pm)
References: <199805022224.QAA03113@ipecac.Central.Sun.COM>
X-Mailer: Z-Mail (4.0b.820 20aug96)
To: talley@boulder.Central.Sun.COM (Steve Talley), zsh-users@math.gatech.edu
Subject: Re: exit value of intermediate program in pipe
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Resent-Message-ID: <"MaGLZ1.0.8A1.Z6zIr"@math>
Resent-From: zsh-users@math.gatech.edu
X-Mailing-List: <zsh-users@math.gatech.edu> archive/latest/1499
X-Loop: zsh-users@math.gatech.edu
X-Loop: zsh-workers@math.gatech.edu
Precedence: list
Resent-Sender: zsh-workers-request@math.gatech.edu

} foo () {
} 	/bin/blah | grep -v "foo"
} }
} 
} I would like this function to exit with the exit value from the
} /bin/blah process, but it exits with the exit value from grep instead.

You can do this:

    foo() {
    	/bin/blah >>(grep -v "foo")
    }

That effectively runs grep in the background and blah in the foreground,
while still connecting them with a pipe.  Then you get the exit status of
blah, but with the side effect that the function returns as soon as blah
finishes, without waiting for the grep -- which may not be what you want.

I don't think there's any other way to do this without using a temp file.

    foo() {
	local outfile=${TMPPREFIX}blah.out
	/bin/blah > $outfile
	local exitval=$?
	grep -v "foo" $outfile
	command rm -f $outfile
	return $exitval
    }

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com