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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.
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.
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