Example below adds user timus to the group www-authors $: sudo usermod -a -G www-authors timus To add user timus to sudoers group, do: $: sudo usermod -a -G sudo timus Note: That for the sudo to take effect you have to logout and log back in. In Debian Buster (10.3), need to reboot for it to take effect Tested on: - Lubuntu (13.04) - Ubuntu (12.04 - 13.04) - Debian Buster (10.3) References: http://www.cyberciti.biz/faq/howto-linux-add-user-to-group/ http://askubuntu.com/questions/7477/how-can-i-add-a-new-user-as-sudoer-using-the-command-line
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