local path = system.pathForFile( "data.txt", system.TemporaryDirectory )
 
-- io.open opens a file at path. returns nil if no file found
local fh, reason = io.open( path, "r" )
 
if fh then
   -- read all contents of file into a string
   local contents = fh:read( "*a" )
   print( "Contents of " .. path .. "\n" .. contents )
else
   print( "Reason open failed: " .. reason )  -- display failure message in terminal
 
   -- create file because it doesn't exist yet
   fh = io.open( path, "w" )
   
   if fh then
        print( "Created file" )
   else
        print( "Create file failed!" )
   end
   
   local numbers = {1,2,3,4,5,6,7,8,9}
   fh:write( "Feed me data!\n", numbers[1], numbers[2], "\n" )
   
   for _,v in ipairs( numbers ) do 
       fh:write( v, " " )
   end
   
   fh:write( "\nNo more data\n" )
end
 
io.close( fh )