Re: [gentoo-user] redirect

["Richard Fish" <bigfish@asmallpond.org>]

On 7/21/06, James Lockie <bjlockie@lockie.ca> wrote:
> How do I redirect the error from an emerge?
> I did 'emerge system 2>&1 >t' and that does most of it but it misses the
> actual error message.

2>&1 >foo is the wrong syntax for what you want.  This first copies
stderr to stdout, and the second part redirects stdout to a file, but
stderr is still going to the file descriptor that stdout originally
refered to.  It is logically the equivalent of:

stdout=1
stderr=2
stderr=$stdout
stdout=foo
echo $stderr

The correct syntax is ">foo 2>&1", which does the logical equivalent of:

stdout=1
stderr=2
stdout=foo
stderr=$stdout

HTH,
-Richard
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