etc/group

   1 root:0
   2 bin:1
   3 daemon:2
   4 shadow:3
   5 games:4
   6 tty:5
   7 disk:6
   8 kmem:7
   9 mail:8
  10 log:9
  11 wheel:10
  12 ftp:13
  13 uucp:14
  14 haldaemon:15
  15 messagebus:16
  16 video:16
  17 audio:17
  18 smmsp:18
  19 sshd:19
  20 nofiles:20
  21 qmail:21
  22 Gqscanq:27
  23 qscand:28
  24 exim:30
  25 uucp:31
  26 lp:32
  27 floppy:33
  28 cdrom:34
  29 tape:35
  30 tape:36
  31 nullmail:38
  32 mysql:39
  33 oracle:40
  34 dba:41
  35 postgres:42
  36 postdrop:43
  37 postfix:44
  38 memcached:45
  39 crontab:53
  40 clamav:54
  41 zeroinst:55
  42 dansguardian:56
  43 cdwserve:57
  44 gdm:66
  45 gopher:70
  46 sfs:71
  47 nagios:76
  48 jabber:78
  49 mailman:79
  50 http:80
  51 partimag:81
  52 pound:82
  53 users:100
  54 ldap:389
  55 jboss:390
  56 secoff:400
  57 nogroup:65534
  58 nobody:65534