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Date: Fri, 01 Jun 2007 12:33:06 +0200
From: Albrecht Schlosser <cygwin AT go4more DOT de>
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Subject: Re: ssh session hangs while running cmd on remote server
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KenLee wrote:
> I have tried ssh using both interactive and command line mode, and I get the
> same results.  That is - sorry for being pedantic about this - I had invoked
> ssh first with the command line option, and it worked.  I invoked ssh again
> with the command line again, but it hung this time.  Then I just invoked ssh
> on its own, and entered the commands one at a time, and it hung again.  
>
> Then I ran cygwin directly on the remote server (thinking that it's the VB
> script causing the problem), so I entered cmd /c update.kcu (without any
> ssh) and it worked just fine.  
>   
Maybe it doesn't "hang" at all ...

Something I can see is that a (windows console) program _seems_ to hang, 
but actually it doesn't. stdout seems to be (block) buffered when run 
from an xterm or rxvt session, but unbuffered when run from a local 
standard cygwin window.

One test to see what happens would be to run the program with stdin 
redirected to /dev/null to get an error message:

cmd /c update.kcu < /dev/null

When I do this, I can see the program's prompt and some output that 
would be missing otherwise.

What happens, if you do that ?

Albrecht

P.S. BTW: Is there a way to set stdout to unbuffered without modifying 
the windows console program?


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