stairtorch.lua

--config
-- torch distance
tD = 4
-- steps
s = 64


-- program

a = 8

turtle.select(1)
turtle.refuel()
for b = 1,s,1 do
    if a == tD then
        turtle.select(2)
        turtle.place()
        a = 0
    else
        turtle.down()
        turtle.forward()
        a = a + 1
    end
end
for b = 1,s,1 do
        turtle.back()
        turtle.up()
end