root::0:root bin::1:root,bin,daemon daemon::2:root,bin,daemon sys::3:root,bin adm::4:root,daemon tty::5: disk::6:root lp::7:daemon mem::8: kmem::9: wheel::10:root ftp::11: mail::12: slocate::13: audio::14: video::15: floppy::16: tape::17: cdrom::18: dialout::19: uucp::20: scanner::21: messagebus::81: nogroup::98: nobody::99: users::100: