BlueInstaller v0.8 (CC 1.3 | Tekkit 1.3.1+ Friendly)

--Name: BlueInstaller
--Version: v0.8
--Author: BlueZero (AKA Stevenmcl)
--Platform: ComputerCraft LUA Environment

file1 = "1"

function blueinstaller()
programInput()
  if userInput == file1 then
    if fs.exists("bluelock") and fs.exists("startup") then
      shell.run("clear")
      print ("BlueLock OS is already installed on this system...")
      sleep(2)
      blueinstaller()
        else
      shell.run("clear")
      print ("Installing BlueLock OS...")
      shell.run("pastebin", "get", "QCc257kv", "bluelock")
      sleep(1)
      print ("Pastebin Downloaded.........[OK]")
        if fs.exists("startup") then
        print ("Startup file detected.")
        print (" ")
        print (" ")
        print ("For BlueLock OS to run properly, you need to add a shell.run command for 'bluelock' in order for it to run properly.")
        sleep(5)
          else
        shell.run("pastebin", "get", "BDXWb1BU", "startup")
        end
      sleep(2)
      print ("BlueLock OS installed Successfully.")
      sleep(2)
      if fs.exists("bluelock") then
        print (" ")
        print (" ")
        print ("BlueLock OS has been installed but requires a restart to initialise.")
        print ("Be sure to type 'reboot', 'shutdown', hold CTRL + R, or hold CTRL + S when you're done.")
        sleep(8)
      end
      blueinstaller()
    end
  end

  if userInput == "credits" then
    shell.run("clear")
    print ("BlueInstaller designed and created by BlueZero (Stevenmcl)")
    print ("Please visit; http://computercraft.net/")
    sleep(5)
    blueinstaller()
  end

  if (userInput == "quit" or userInput == "exit" or userInput == "stop") then
    shell.run("clear")
    print ("Goodbye.")
    sleep(2)
    shell.run("clear")
    error()
  end

  if ((userInput ~= file1) and (userInput ~= "credits")) then
    shell.run("clear")
    print ("Invalid Option, please try again.")
    sleep(2)
    blueinstaller()
  end
end

function programInput()
  shell.run("clear")
  print ("BlueInstaller v0.8 running on OS Version: ", os.version())
  print ("to view credits, type 'credits'.")
  print ("To exit, type: 'quit', 'stop', or 'exit'.")
  print (" ")
  print ("One Program Currently Available: ")
  print (" ")
  print ("BlueLock OS: 1")
  print (" ")
  write ("Option: ")
  userInput=io.read()
end

blueinstaller()