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Debian GNU/Linux FAQ
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10.2 How can I provide access to hardware peripherals, without compromising security?

Many device files in the /dev directory belong to some predefined groups. For example, /dev/fd0 belongs to the floppy group, and /dev/dsp belongs to the audio group.

If you want a certain user to have access to one of these devices, just add the user to the group the device belongs to, i.e. do:

     adduser user group

This way you won't have to change the file permissions on the device.

Debian GNU/Linux FAQ
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