From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Date: Mon, 15 Sep 2008 09:08:37 +0000
Subject: Re: Alter a sysfs attribute??
Message-Id: <48CE2615.4090302@tuffmail.co.uk>
List-Id: <linux-hotplug.vger.kernel.org>
References: <571445d80809141048m5b06d3d9j734ec46c4a50fbfd@mail.gmail.com>
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To: linux-hotplug@vger.kernel.org

Jay Otis wrote:

> Hello all, I am using Ubuntu Hardy and I need to change the
> "max_sectors" attribute of my usb device on boot but RUN+="/bin/echo
> 1024 > /sys/block/%k/device/max_sectors" does not seem to change the
> value. I've tried su -... and su username -c... the command runs from
> a root terminal and from a startup script in init.d just not from udev
> :s

Redirection is a shell function.  udev does not automatically run
commands through a shell.

Try

RUN+="/bin/sh -c echo 1024 > /sys/block/%k/device/max_sectors" 

Regards
Alan