local pullEvent = os.pullEvent
os.pullEvent = os.pullEventRaw

local function centerText(text)
local x,y = term.getSize()
local x2,y2 = term.getCursorPos()
term.setTextColor(colors.red)
term.setCursorPos(math.ceil((x / 2) - (text:len() / 2)), y2)
write(text)
end

hello=true
while hello==true do
 term.clear()
 centerText("Press Enter for emergency:")
 input = read()
 if input == "terminate" then
  os.pullEvent = pullEvent
  hello=false
  term.clear()
  term.setCursorPos(1, 1)
 elseif input == "" then
  redstone.setOutput("bottom", true)
  sleep(0.1)
  redstone.setOutput("bottom", false)
 end
end