function blankLine(line,startFrom)
  local ox,oy = term.getCursorPos()
  if not line then oy = line end
  if not startFrom then startFrom = ox end
  local w = term.getSize()
  local wx = w - startFrom + 1
  term.setCursorPos(startFrom,line)
  term.write(string.rep(" ",wx))
  term.setCursorPos(ox,oy)
end