{HEAD ~ Method} for retrieving previous input commands to an external program from {TAIL ~ an editor environment} 
{ HEAD ~ Method } for retrieving previous input commands to an external program from { TAIL ~ an editor environment }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL