getScreenSize

shell.run("clear")
term.setCursorPos(0,0)

while true do
 local BeforeX,BeforeY = term.getCursorPos()
 io.write("#")
 sleep()
 local TestScreenSizeX,TestScreenSizeY = term.getCursorPos()
 if TestScreenSizeY == 1 then
  ScreenSizeX = BeforeX
  break
 end
end

shell.run("clear")

term.setCursorPos(0,1)
while true do
 local BeforeX,BeforeY = term.getCursorPos()
 term.setCursorPos(0,BeforeY)
 print()
 sleep()
 local TestScreenSizeX,TestScreenSizeY = term.getCursorPos()
 if TestScreenSizeY == BeforeY then
  ScreenSizeY = BeforeY
  break
 end
end

shell.run("clear")
print(ScreenSizeX)
print("x")
print(ScreenSizeY)
sleep(2)