What are all those allready existing usergroups in linux
ie adm, rpcuser etc etc.

does somebody maybe have some manual to help me with this

im running and installing everything under root account because i'm not sure wich groups to become a member of
thnks

"What are all those allready existing usergroups in linux"

The group structure varies from one distribution to the next. You can find out what groups you have on your machine by typing in:
less /etc/group

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Steve Stites

"id <username>" will list what groups you belong to. If you have a user account you should be able to run programs and access most things fine. You should only need root access for installing software.

id bil
uid=1000(bil) gid=1000(bil) groups=1000(bil),24(cdrom),25(floppy),29(audio),30(dip),44(video),432(usb),1001(staff),111(cdrecordi ng),1005(plex86)

As you see 1000 is my user id and group id. (each linux user also has a group of the same name) The rest are groups that I belong to, but since I use Libranet it makes seperate groups for cdrom, floppy, and audio. Other distros don't do this I think. Since I have a cd burner there is a seperate cdrecording group created so that I don't need root access to burn cd's. The usb group allows be to access usb devices. The plex86 group was crated when I installed the plex86 program, and I created staff so that I could mount the staff nfs patition which uses strict user and group id's.
dip I think is for sound and the video I think is to allow me to start the X server.

Hope this helps out a bit.