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Adding user to some other groups


I'm building a live usb stick which uses some Comedi hardware. the Comedi 
drivers produce device nodes with group "iocard" having read/write perms. It 
would be great if I could think of a way to add user to group iocard, but 
making a chroot hook with adduser user iocard won't work - because user 
doesn't exist at build time?

Is there a good way to do this, or will everything end up having to be sudo'd?



Dr Nicholas Bailey			http://www.n-ism.org/People/nick.php
Science and Music Research Group,
School of Engineering, The University of Glasgow

Find out about our Music Informatics MSc:	http://www.n-ism.org/SPECTRUM
Signal Processing, Electronics and Computing Techniques
	for Researching and Understanding Music

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