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.