Would someone kindly explain when the following groups should be used? bin:*:2: sys:*:3: adm:*:4: kmem:*:15: staff:*:50: www-data:*:33: dip:*:30: uucp:*:10: irc:*:39: (Recently I created a new group and wondered why my dialout system didn't work since the debian isdn package style affords the wanted user to be added to the dialot group) Robert