nixCraft

I recommend using GUI tool called Users Administration. The Users Administration Tool allows you add, delete and modify the existing users and groups in your system. To start

Click on System > Administration > Users and Group

You can also start tool from command line / terminal:
Also you can use usermod command to add user to group. useradd command create a new user.

Add user sweta to group minerals
To add user to the supplemental group user usermod as follows:
More info

1. Howto: Linux add user to group
2. man useradd
3. man usermod

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