Device access (cont)

Device access is controlled by standard Linux file permissions.

Modem access requires group 'dialout'
         $ ls -la /dev/modem
         crw-rw----  1 root   dialout    4,  67 Mar 27 16:43 /dev/modem

         $ ls -la /usr/bin/minicom /usr/bin/cu
         -rwxr-xr-x  1 root   uucp       169132 Nov 20  2001 minicom
         -rwxr-xr-x  1 root   uucp       371742 Dec 12  2000 cu

         $ grep dialout /etc/group
         dialout:x:20:bri