User Private Group not created in linux

[siddapur]

Dear All, When I try to add a user I used to get user: group 100 does not exist error. So I created a group with group id 100. After that when ever I try to add a new user it is not creating User Private Group in that users name. By default it is taking group id 100 as primary group. How can I make it create a new User Private Group and take that group as new users primary group when ever I add a new user using useradd command.

thanks and regards
Sadguru

 

[stefanwagner]

It sounds a little curious - a private group, where only one user is in.
Is this a group?

Ok - there might be reasons, to have such groups.
Of course useradd wasn't created with such recommendations in mind.

Therefore I would create a script 'privateUseradd', which creates a new group, and then calls useradd with that group.
If the expected number of maximum users is known, you could reserve a scope of numbers for GID and UID and make them match - for 300 users 2000-3000, for 30 users 2100-2200 i.e..
You could save the 'lastGID' and create the next GID as lastGID+1.

If I understood correctly.

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[ericbrunson]

Redhat useradd behaves like that by default, creating a new group for every new user.

 

[groovin]

RH does this for security reasons... i guess it just adds another layer of user/group level control.

a script would be the best way of doing this. simple bash script would only take a handful of lines.