A.1.4 Unix USB Permissions

In most cases the kernel driver initializes a plug-and-play device to be owned by user root and group root with only r/w permission for the user root rendering the device inaccessible to regular users. Whilst users can run AVRDUDE sessions as root this is definitely not good practice. Giving USB plug-and-play devices the correct permissions is much better. USB AVR programmers are normally identified by a two-byte hexadecimal vendor ID and a two-byte hexadecimal product id. Both are typically used to identify the device that needs new permissions.

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