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From: willcr@bud.sos.ivy.isc.com (Will Crowder)
Newsgroups: comp.unix.wizards
Subject: Re: How does one redirect just stderr under the C Shell?
Message-ID: <1991May09.001313.23696@ism.isc.com>
Date: 9 May 91 00:13:13 GMT
References: <2740@umriscc.isc.umr.edu> <1991May08.154738.26889@convex.com>
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In article <1991May08.154738.26889@convex.com>, tchrist@convex.COM (Tom
Christiansen) writes:

> From the keyboard of rwl@ee.umr.edu (Wayne Little):
> > [How do I redirect stderr independent of stdout under C Shell?]
>
> In general, it can't be done.  
> 
> Now, I'm sure someone will suggest
> 
>     ( foo > foo.stdout ) >& foo.stderr
> 
> but that's not right: stdout is mangled.

How is stdout mangled?  Is it because "isatty(fileno(stdout))" will no
longer be true?

>                                            Someone else
> will suggest
>
>     ( foo > /dev/tty ) >& foo.stderr
> 
> but that's not right, as stdout is no longer going where it
> had been going.  

Now this, at least, I see.  If the above were part of a pipeline in which
stdout had already been redirected, things would go awry quite quickly, as well
as in a number of other scenarios as well, I'm sure.

Redirector emptor!  :) :) :)

|> If your system should support /dev/fd pseudo-devices, this 
|> ought to work:
|> 
|>     ( foo > /dev/stdout ) >& foo.stderr
|> 
|> But few of us have that feature on our systems.  

I sure wish my system (Sun) did!  That sounds like the right general solution
to me.

Actually, I suggested both of the above in e-mail, with the disclaimer
"I'm no wizard."  Glad I put that disclaimer on there...although I did
get mail back from Wayne saying it worked fine for his particular case.

|> --
|> Tom Christiansen		tchrist@convex.com	convex!tchrist
|> 		"So much mail, so little time." 
                 ^^^^^^^^^^^
That's why I posted this...

Will

--------------------------------------------------------------------------------
Will Crowder, MTS            | "I was gratified to be able to answer quickly,
(willcr@ivy.isc.com)         |  and I did: I said I didn't know."
INTERACTIVE Systems Corp.    |		-- Mark Twain