Re: How to capture stderr of dos process running in bash shell??

[Christopher Faylor <cgf-use-the-mailinglist-please at cygwin dot com>]

On Sun, Nov 15, 2009 at 06:59:03PM -0800, aputerguy wrote:
>
>Dave Korn writes...
>>  So, it just doesn't work, and that's using all MS software; it's not
>> going
>> to work any better in bash.  I think you're probably out of luck here; I
>> don't
>> know any way to capture direct console output like that (short of some
>> sort of
>> screen scraper or even if you want a wooden table solution taking a
>> snapshot
>> and OCRing it...!)
>
>True... just for the record, you can capture stderr to a file using the flag
>/errorlog=<file> or even dump it to /dev/null using /errorlog=$(cygpath -w
>/dev/null) or equivalently /errorflag=\\.\NULL which to my surprise actually
>worked. And once you have split off stderr, you are left with just the
>output on stdout which is now in the bash world so you can treat it using
>standard bash pipes and redirection.
>
>I just couldn't figure out how to pipe the stderr -- since in my case I
>wanted to pipe it through gzip before capturing it to a file. So, instead I
>do the slightly less elegant thing of first capturing to a file and then
>running gzip later on that file.
>
>I do agree with you though that the original question is probably more a
>question of a broken windows program and I'm thinking that the help is just
>plain wrong in saying that the error is on stderr but rather I believe that
>stdout and stderr are a single stream unless you use /errorlog to explicitly
>fork it off to a file.

Ok, then since we've confirmed that this problem has nothing to do with
Cygwin, I think it's time to close down this thread.

cgf

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