Best place to get familiar with user groups

chicken dance · 01-27-2015, 08:31 AM

Hi all

Just as the subject says. I would like to learn allot more about user groups and i don't really know where to start. I know that groups are usually for services but how does one find out what each group allows the user to do on any given machine? how many groups are there? are they different between distros? can you make your own and how would you link it to a service or services etc etc.. If anyone can point me in the right direction that would be very much appreciated.

Thanks.

smallpond · 01-27-2015, 12:23 PM

UNIX and Linux System Administration Handbook
by Evi Nemeth, Garth Snyder

It has a whole chapter on access control. I loaned my copy to somebody about 10 years ago and haven't seen it since.

fatmac · 01-27-2015, 01:31 PM

These may help.

http://unix.stackexchange.com/questi...ble-to-a-group
https://wiki.archlinux.org/index.php/users_and_groups

veerain · 01-28-2015, 03:24 AM

See this:

http://en.wikipedia.org/wiki/File_system_permissions

Habitual · 01-28-2015, 10:02 AM

Any Linux book printed in the last 20 years will have a summary of the Linux file system and user groups and permissions.
Try a Library.

rtmistler · 01-29-2015, 07:24 AM

A lot of good resources already given. As far as I know the default way of making a user, makes a same named group for that user. Or at least that's a similar experience to what happens when I create a new user. Like if I make a user named "john", there will be a group "john" and that new user will be a member of that group. You can of course assign that user to be in many groups. Not sure the limits on the number of groups, but I bet it's very large. And similar, I bet the number of allowable users is also large.

Daws · 01-29-2015, 02:31 PM

Your profile says you use debian, check out

Code:

/usr/share/doc/base-passwd/users-and-groups.txt.gz

It contains a brief overview.