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I'd like to always give my user the permission to write on a specific file located in the /sys folder.
This because in the solution I posted here I have the problem that every time I reboot I have to reset the permission on the file with chmod.

I tried to follow this guide but it didn't work. According to this I have to create a sh script, mine consiste in just this line:

/bin/chmod 644 /sys/class/leds/asus::kbd_backlight/brightness

Thanks

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Did you add the script to /etc/init.d? You have to symlink the script you wrote to /etc/init.d so that it runs at startup. 

sudo chmod 744 /etc/init.d/fan-speed-init.sh
sudo chown root:root /etc/init.d/fan-speed-init.sh
sudo ln -s /etc/init.d/fan-speed-init.sh /etc/rc2.d/S99fan-speed-init.sh
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yes you're right I skipped that step because in that guide i've read "This multiple linking could be done smarter by issuing the update-rc.d -f fan-speed-init.sh start 99 2 3 4 5 .". Thanks for your help – kuus Dec 31 '12 at 4:15

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