From owner-freebsd-questions  Tue May 27 03:13:39 1997
Return-Path: <owner-questions>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id DAA06469
          for questions-outgoing; Tue, 27 May 1997 03:13:39 -0700 (PDT)
Received: from mail.EUnet.hu (www.eunet.hu [193.225.28.100])
          by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id DAA06464
          for <freebsd-questions@freebsd.org>; Tue, 27 May 1997 03:13:36 -0700 (PDT)
Received: by mail.EUnet.hu, id MAA14130; Tue, 27 May 1997 12:12:54 +0200
Received: (from zgabor@localhost) by CoDe.hu (8.7.5/8.7.3) id LAA00404; Tue, 27 May 1997 11:09:21 +0200 (MET DST)
From: Zahemszky Gabor <zgabor@CoDe.hu>
Message-Id: <199705270909.LAA00404@CoDe.hu>
Subject: Re: What command line to redirect 'make world' warnings ?
To: freebsd-questions@freebsd.org (FreeBSD questions)
Date: Tue, 27 May 1997 11:09:20 +0200 (MET DST)
Cc: ATuretta@stylo.it, un_x@anchorage.net
In-Reply-To: <31EBCC36B676D01197E400801E032495021F4A@STYLOSERVER> from Angelo Turetta at "May 26, 97 09:36:00 pm"
X-Mailer: ELM [version 2.4ME+ PL11 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-questions@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

> I've run:
> 
> 	make world 2>&1 > /proxy/world3
> 
> and I would expect both stdout and stderr to go to file /proxy/world3.
> Instead, warnings & errors continue to be directed to my tty.
> 
> What should be the right command line ? (I'm using bash)

1)
As somebody else said it, the correct form is:

make world > /proxy/world3 2>&1

because redirection occures (most of the times) from left to right.
So, in your version:
stdout goes to tty
stderr goes to tty
	redirection 2>&1
stderr goes to the same place as stdout, which is (of course) tty
	redirection > file
stdout goes to file

With the correct version:
	redirection > file
stdout goes to file
	redirection 2>&1
stderr goes to the same place, as stdout, which is (now) file

This type of redirection is working on all of the Bourne-shell-like
shells (sh/ksh/pdksh/bash/zsh)

2)
RTMF!  from bash manual:
---
       Note that the order of redirections is  significant.   For
       example, the command

	      ls > dirlist 2>&1

       directs	both  standard	output	and standard error to the
       file dirlist, while the command

	      ls 2>&1 > dirlist

       directs only the standard output to file dirlist,  because
       the  standard  error  was  duplicated  as  standard output
       before the standard output was redirected to dirlist.

....

   Redirecting Standard Output and Standard Error
       Bash  allows  both the standard output (file descriptor 1)
       and the standard error output (file descriptor  2)  to  be
       redirected to the file whose name is the expansion of word
       with this construct.

       There are two formats for redirecting standard output  and
       standard error:

	      &>word
       and
	      >&word

       Of  the two forms, the first is preferred.  This is seman-
       tically equivalent to

	      >word 2>&1

This type of redirection is working only in bash (and not in any other
sh-like shells - as I know -, but it works with csh, and other csh-like
versions - tcsh, itcsh (I think, I've newer used itcsh)).

3)
If you like, you can use your method, but with some minor corrections:
( make world 2>&1 >> /proxy/world3 ) > /proxy/world3
or
{ make world 2>&1 >> /proxy/world3 ; } > /proxy/world3

Of course, without the parentheses, it doesn't work (well, it shouldn't),
and you have to use append ( >> ) inside.  Well, why?  It's your exercise.

Bye, Gabor
--
#!/bin/ksh
Z='21N16I25C25E30, 40M30E33E25T15U!' ;IFS=' ABCDEFGHIJKLMNOPQRSTUVWXYZ ';set $Z;for i { [[ $i = ? ]]&&print $i&&break;[[ $i = ??? ]]&&j=$i&&i=${i%?};typeset -i40 i=8#$i;print -n ${i#???};[[ "$j" = ??? ]]&&print -n "${j#??} "&&j=;typeset +i i;};IFS=' 0123456789 ';set $Z;X=;for i { [[ $i = , ]]&&i=2;[[ $i = ?? ]]||typeset -l i;X="$X $i";typeset +l i;};print "$X"