sudo usermod -aG sudo <username>
usermod -a -G YOUR_GROUP YOUR_USERNAME
usermod -s /usr/sbin/nologin myuser
ssh and scp will fail
Related commands
See also
sudo, id, visudo, useradd, userdel, usermod, groups, passwd, chown, chmod, chgrp, groupadd, groupdel, Passwordless sudo, passwd (package), sudo --help
