To add someone to a group just edit /etc/group. You would want to make make a line like the following:
Quote:
pppusers:x:44:user1,user2,etc
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NOTE: 44 is just an arbitrary GID. Make sure you do not use a number that is already used. You can use the groupadd command to add the group.
Then just group own (chgrp) the modem to pppusers and you should be all set.