private static String[] addUserGroups(String[] tk)
{
List <Group> gl;
if (tk.Length < 3)
{
return(str2arr("Missing arguments. Usage: addUserGroups <userID> <groupName1> [groupName2] .. [groupNameN]"));
}
gl = sm.addGroups(tk.Skip(2).ToList(), int.Parse(tk[1]));
return(gl == null?str2arr("Error!") : gl.Select(g => g.groupID + "\t" + g.nameGroup).ToArray());
}