 | | | usermod | usermod 2005-03-30 - By Steve Buehler
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At 08:50 AM 3/30/2005, McDougall, Marshall (FSH) wrote:
>> >>I know you can use "usermod" on RedHat Linux to add a user to another
>>group
>> >>by typing:
>> >>usermod -G sam,frank steve
>> >>This would effectively add steve to the "frank" and "sam" group. How do
>> >>you remove them from those groups without editing the /etc/group file
>> >>manually? I can do:
>> >>usermod -G steve steve
>> >>That will remove him from "sam" and "frank" groups but would add steve to
>> >>his own group so the /etc/group file would look like:
>> >>steve:x:590:steve
>> >>instead of just:
>> >>steve:x:590:
>> >>For the life of me, I can't figure this one out. Does anybody know?
>>
>> >If you "usermod -G sam,frank steve" and realize that you shouldn't have put
>> >steve in the frank group, just "usermod -G sam steve" and by omission, will
>> >remove the user from the group. HTH
>>
>>Yes, but what if I want to remove him from both groups. You can't type
>>"usermod -G steve". Basically, I am wanting to remove him from ALL groups
>>except for his initial group. And "usermod -g steve steve" will not do it
>>either. The "-G" must have atleast one group as an
>>option..................................I just tried something that seems
>>to work, but not sure if it is suppose to work this way. I typed:
>>usermod -G "" steve
>>and that removed steve from all extra groups. So either my problem is
>>solved, or there is another "proper" way of doing it.
>
>"usermod -Gsteve steve" should remove him from all groups except steve. If
>the group is in the list, then the user is added to the group. If the group
>is not in the list, then the user is removed from any groups not in the
>list. This is the way I go about it. We all know that with *nix, there is
>always more than 1 way to accomplish it.
I know it shouldn't hurt to do that, but if you do, it actually adds steve
to his own group again. So instead of the line in the /etc/group file
looking like the following which is how it should look if they are not in
any other group:
steve:x:590:
it would then look like the following if you run "usermod -Gsteve steve":
steve:x:590:steve
Thanks
Steve
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