cc monitor signs

local m = peripheral.wrap("bottom")
m.setTextScale(0.5)
m.clear()
lines = {}

local function writeCentered(text, y)
    local width, _ = m.getSize()
    m.setCursorPos(math.floor((width-#text)/2)+1, y)
    m.write(text)
end

local function writeLines(lines)
    for i=1, #lines do
        writeCentered(lines[i], i)
    end
end

writeLines(lines)