This command can be used to add new users to a system. However, it is also useful for adding a user to a group. In other words, this command can be used to expand the membership of a group.
For example, to add delenn to the group greycouncil, one can use the following command:
To undo this membership expansion (to remove delenn from the group greycouncil):
adduser is a particularly userful command to add a user to useful groups in a system, especially in the case of a workstation. For example, adding a user to the saned group allows a user access scanners that are connected to a workstation.
However, in the context of a server, group ownership should be assigned with great care.