## getopt.lua

    #! /usr/bin/env lua

    local getopt = require 'posix.unistd'.getopt

    local last_index = 1
    for r, optarg, optind in getopt(arg, 'ha:s:') do
       if r == '?' then
          return print('unrecognized option', arg[optind -1])
       end
       last_index = optind
       if r == 'h' then
          print '-h      print this help text'
          print '-a ARG  a flag with required argument'
          print '-s ARG  a different flag with a required argument'
       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

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