Re: cmd.exe bug in win2k sp4 in "for" loop

["Maxime Ducharme" <mducharme () cybergeneration com>]

Hi Aditya,
    this is not a bug, but normal operation of
msdos command interpreter.

There is a concept of different outputs for
normal output and errors.

They are called "stdout" and "stderr".

stdout = 1
stderr = 2

When you redirect a program's output, you may
specifiy which output you want (stdin or stderr).

By default stdout is used, so a "1" is added before
the redirections ">" or ">>".

If you want to catch errors, you need to specify
stderr output like this :

echo "ello" 2>>stderr.log

You may also catch each of them like this :

echo "ello" 1>>stdout.log 2>>stderr.log

You may find more details here :
www.microsoft.com/windowsxp/home/using/productdoc/en/redirection.asp

This is XP details, but I think it is the same behavior on NT, 2K and 2003.

Have a nice day

Maxime Ducharme
Programmeur / Spécialiste en sécurité réseau

----- Original Message ----- 
From: Aditya, ALD [Aditya Lalit Deshmukh]
To: Full-Disclosure@Lists. Netsys. Com
Sent: Tuesday, August 17, 2004 1:31 AM
Subject: [Full-disclosure] cmd.exe bug in win2k sp4 in "for" loop


On windows 2000 SP4 the command processor cmd.exe has a small bug in the for
loop see the attached image, this is making all the bat file go crazy with
the output see the selected potions....

is this a known bug, with a patch ? can it be reproduced on other NT/2k/XP/3
versions of windows ?

-aditya

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