local P = require 'posix'

local short = "ha:s:"

local long = {

  {"help",  "none", 'h'},

  {"aleph", "required", 'a'},

  {"start", "required", 's'}

}

local last_index = 1

for r, optarg, optind, li in P.getopt (arg, short, long) do

  if r == '?' then

    return print  'unrecognized option'

  end

  last_index = optind

  if r == 'h' then

    print 'help'

  elseif r == 'a' or r == 's' then

    print ('we were passed', r, optarg)

  end

end

for i = last_index, #arg do

  print (i, arg[i])

end