{ int c;

while (1) { static struct option long_options[] = { /* These options set a flag. */ {"verbose", 0, &verbose_flag, 1}, {"brief", 0, &verbose_flag, 0}, /* These options don’t set a flag. We distinguish them by their indices. */ {"add", 1, 0, 0}, {"append", 0, 0, 0}, {"delete", 1, 0, 0}, {"create", 0, 0, 0}, {"file", 1, 0, 0}, {0, 0, 0, 0} }; /* getopt_long stores the option index here. */ int option_index = 0;

c = getopt_long (argc, argv, "abc:d:", long_options, &option_index);

/* Detect the end of the options. */ if (c == -1) break;

switch (c) { case 0: /* If this option set a flag, do nothing else now. */ if (long_options[option_index].flag != 0) break; printf ("option %s", long_options[option_index].name); if (optarg) printf (" with arg %s", optarg); printf ("\n"); break;

case ’a’: puts ("option -a\n"); break;

case ’b’: puts ("option -b\n"); break;

case ’c’: printf ("option -c with value ‘%s’\n", optarg); break;

case ’d’: printf ("option -d with value ‘%s’\n", optarg); break;

case ’?’: /* getopt_long already printed an error message. */ break;

default: abort (); } }

/* Instead of reporting ‘--verbose’ and ‘--brief’ as they are encountered, we report the final status resulting from them. */ if (verbose_flag) puts ("verbose flag is set");

/* Print any remaining command line arguments (not options). */ if (optind < argc) { printf ("non-option ARGV-elements: "); while (optind < argc) printf ("%s ", argv[optind++]); putchar (’\n’); }

exit (0); }

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