term.clear()

local printcentred =
function(text)
local maxw, maxh = term.getSize() --screen dimensions
local curx, cury = term.getCursorPos() --cursor pos
term.setCursorPos((maxw-#text)/2,cury) --set it to the point where write will make the text centred
term.write(text) --write the text
term.setCursorPos(curx,cury+1) --return the cursor to the same position on the next line
end
local maxw, maxh = term.getSize() --screen dimensions
term.setCursorPos(1,math.floor(maxh/2))--set cursor to the start of the upper middle line
printcentred("Welcome To")--print centred on that line
printcentred("Server Name")--print centred on the next line