#!Lua

local number = function(file)
 local n = 0
 for line in io.lines(file) do
   if string.len(line) > 0 then
     n = n + 1
     print(string.format("%d %s",n,line))
   else
     print(line)  
   end -- if
 end -- for
end -- function

if arg[1] then number(arg[1]) else  print "No file given"  end
