Re: stderr issues when running bat scripts

[Igor Pechtchanski <pechtcha at cs dot nyu dot edu>]

On Wed, 28 Jan 2004, Clint Bennion wrote:

> Although this appears on the surface to be a windows issue I am bringing
> this to the cygwin group for two reasons.
> 1 - It only fails when I run it from a bash shell.
> 2 - It recently started failing.  I re-installed an older version of the
> cygwin package and the problem goes away.
>
> Version that failed:
> Cygwin 1.5.6-1
>
> Tested working version:
> Cygwin 1.5.5-1
>
> OS
> Windows 2000 Professional
> 5.0.2195 Service Pack 4 Build 2195

There's more to your Cygwin configuration than the version of the DLL.
Please read and follow <http://cygwin.com/problems.html>.  Attaching the
output of "cygcheck -svr" is not optional.

> Here are two scripts for a test case.  The bat script calls the cscript in a for loop.  The for
> loop catches the last line from stdout and puts it in the variable out.  The cscript simply puts
> the text "STDOUT" to stdout and "STDERR" to stderr.
>
> ======Start tst.bat
> rem echo "" 1>&2
> echo "********************************"
> set CMD=cscript /nologo tst.wsf
> FOR /F "delims=#" %%A IN ('%CMD%') DO set OUT=%%A
> echo %OUT%
> ======End tst.bat
> ======Start tst.wsf
> <package>
>         <job id="test">
>                 <script language="JScript">
>                         WScript.stderr.writeLine( "STDERR" );
>                         WScript.stdout.writeLine( "STDOUT" );
>                 </script>
>         </job>
> </package>
> ======End tst.wsf
>
> ======Start output
> m:\class\cmd>rem echo "" 1>&2
>
> m:\class\cmd>echo "********************************"
> "********************************"
>
> m:\class\cmd>set CMD=cscript /nologo tst.wsf
>
> m:\class\cmd>FOR /F "delims=#" %A IN ('cscript /nologo tst.wsf') DO set OUT=%A
>
> m:\class\cmd>set OUT=CScript Error: Execution of the Windows Script Host failed.
>  (Unspecified error
>
> m:\class\cmd>set OUT=)
>
> m:\class\cmd>echo )
> =========End Output
>
> There are multiple things that I can do to get the scripts to run.
> 1) Uncomment the first echo line.  This line redirects a return to stderr.
> 2) Don't ever send to stderr in the cscript
> 3) Redirect either stdout or stderr to a file when running tst.bat
>
> Another interesting test case that I will describe.  Adding a line with
> "%CMD%" before and after the for loop causes the cscript to be called
> directly.  In this case the first call succeeds.  The for loop fails and
> the next call to cscript fails.
>
> I probably shouldn't do this, since I know so little about the inner
> workings, but here is my musings. It would seem that the for loop causes
> special problems.  Possibly because it is doing a form of redirection,
> stdout to the set commands and stderr should go to the screen.
> Although this causes problems for future calls to cscript I don't know
> why.  It must be that adding the echo to stderr at the first causes the
> plumbing for stderr to be setup properly and all future commands
> succeed.  There is no need to respond to this paragraph.  I wrote it
> just to help get the thought process going if it is needed.
>
> Clint

Did you try the latest snapshot?  There were some problems with 1.5.6 that
were fixed in CVS.  See <http://cygwin.com/snapshots/>.
	Igor
-- 
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    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

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to the bathroom is a major career booster."  -- Patrick Naughton

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