Rhasacommandlineinterfacethatoffersconsiderableadvantagesovermenusystemsintermsofefficiencyandspeedoncethecommandsareknownandthelanguageunderstood.However,thecommandlinesystemcanbedauntingforthefirst-timeuser,sothereisaneedforconcisetextstoenablethestudentoranalysttomakeprogres