console.height readonly property
The console.height property gets the current console height in character. That value depends on the current console window size.
Example
local console = require "console"
console.color = "lightmagenta"
-- get the line in the middle of the console
local ypos = math.floor(console.height/2)
-- scroll "Hello World !" on that line
for i=1,console.width-13 do
if i>1 then
console.locate(i-1, ypos)
console.write(" ")
end
console.locate(i, ypos)
console.write("Hello World !")
sleep(1)
end