CheckSudoers tests a suders file using `visudo`.

GroupAdd creates a group on a host using `groupadd` optionally specifying the GID to create the group with.

RemoveUserExpirations uses chage to remove any future or past expirations associated with the given username.

SetUserGroups adds a user to a list of specified groups on a host using `usermod`, overriding any existing supplementary groups.

UserAdd creates a user on a host using `useradd`.

UserDel deletes a user on a host using `userdel`.

UserHasExpirations determines if the given username has an expired password, inactive password, or expired account by parsing the output of 'chage -l <username>'.

man GROUPADD(8), exit codes section.

man USERADD(8), exit codes section.

UserOpts allow for customizing the resulting command for adding a new user.