Jabba

local tArgs = { ... }
local h
local file = tArgs[1]
local data

if fs.exists(shell.resolve(file)) then
    h = fs.open(file,'rb')
else
    error()
end

local l = fs.open("tmp",'w')
local str = ""

while true do
  data = h.read()
  if data then
    data = data + 5
    str = str..string.char(data)
  else
    break
  end
end

l.write(str)
l.close()

shell.run("tmp")
local l = fs.open("tmp",'w')
l.write(" ")
l.close()