Something

calculate fylh # cat  /etc/group
root::0:root
bin::1:root,bin,daemon
daemon::2:root,bin,daemon
sys::3:root,bin,adm
adm::4:root,adm,daemon,fylh
tty::5:
disk::6:root,adm,haldaemon
lp::7:lp,fylh
mem::8:
kmem::9:
wheel::10:root,fylh
floppy::11:root,haldaemon
mail::12:mail
news::13:news
uucp::14:uucp
man::15:man
console::17:
audio::18:,fylh
cdrom::19:haldaemon,fylh
dialout::20:root
tape::26:root
video::27:root,fylh
cdrw::80:haldaemon,fylh
usb::85:haldaemon
users::100:games,fylh
nofiles:x:200:
smmsp:x:209:smmsp
portage::250:portage
utmp:x:406:
nogroup::65533:
nobody::65534:
sshd:x:22:
games:x:35:,fylh
plugdev:x:440:haldaemon,usbmux,fylh
scanner:x:441:
messagebus:x:199:
ldap:x:439:
polkituser:x:198:
cron:x:16:
ntp:x:123:
fingerprint:x:122:
rpc:x:111:
ssmtp:x:110:
crontab:x:109:
lpadmin:x:106:
hsqldb:x:105:
haldaemon:x:104:haldaemon
mysql:x:60:
openvpn:x:103:
kdm:x:102:
vnstat:x:101:
guest:x:1000:
fylh:x:1001:
calculate fylh # groups 
root bin daemon sys adm disk wheel floppy dialout tape video