From owner-freebsd-questions Sat Apr 21 11:16:59 2001 Delivered-To: freebsd-questions@freebsd.org Received: from cgmd76206.chello.nl (d9168.upc-d.chello.nl [213.46.9.168]) by hub.freebsd.org (Postfix) with ESMTP id 9503537B423 for ; Sat, 21 Apr 2001 11:16:56 -0700 (PDT) (envelope-from edwin@cgmd76206.chello.nl) Received: by cgmd76206.chello.nl (Postfix, from userid 1001) id AD9233AB; Sat, 21 Apr 2001 20:16:55 +0200 (CEST) Date: Sat, 21 Apr 2001 20:16:55 +0200 From: Edwin Groothuis To: josh gregory Cc: freebsd-questions@FreeBSD.ORG Subject: Re: question about FreeBSD Message-ID: <20010421201655.G504@cgmd76206.chello.nl> Mail-Followup-To: Edwin Groothuis , josh gregory , freebsd-questions@FreeBSD.ORG References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from josh_gregory05@hotmail.com on Sat, Apr 21, 2001 at 01:00:46PM -0500 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sat, Apr 21, 2001 at 01:00:46PM -0500, josh gregory wrote: > if one logged into a remote box and issued the command ---> > > yes '/.(++),\ 0123456789 @][<->*^% ABCDE FGHIJKLM NOPQRSTU VWXYZ :{}; > abcdefghijklmn' > > what would one possibly be using this command for? If you look at the function for the yes command (man 1 yes), you'll see that it returns a lot of y's. Or the string you give on the commandline. So for this one, that string is returned. When doing this on my local LAN, I got about 1.7M kilobits per second of traffic. Imagine doing this from ten machines on my local lan, it would kill the total traffic towards this computer (it's only a 10Mb ethernet, that's enough for educational purposes here at home :-). So, I hack your computer (ISDN link maybe), go back to another hacked computer and start this program. That will completly saturate your link. If you have a fast link, I just use more of my hacked computers and you won't be able to do anything anymore over that link. So euh... see where he was coming from and what he was doing on your computer. Edwin, could be totally wrong about this. -- Edwin Groothuis | Personal website: http://www.MavEtJu.org edwin@mavetju.org | Interested in MUDs? Visit Fatal Dimensions: ------------------+ http://FatalDimensions.nl.eu.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message