Aim of this paper is to give an introductory overview of what is typically called the ?plasma magnetic control problem? in tokamak machines. Tokamaks are devices with a toroidal symmetry; these devices are, at the present, the most promising for producing nuclear fusion between two atoms on earth. Among the many technological and theoretical problems to solve, a significant part is represented by control-related problems. Indeed, in tokamak machines, there are quite a number of problems that need the expertise of control theoreticians to be tackled; this paper deals with the most mature and assessed of these problems: plasma current, position and shape control.