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+/* Example of Parsing Long Options with getopt_long.
+   Copyright (C) 1991-2017 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+/* Flag set by @samp{--verbose}.  */
+static int verbose_flag;
+
+int
+main (int argc, char **argv)
+{
+  int c;
+
+  while (1)
+    {
+      static struct option long_options[] =
+	{
+	  /* These options set a flag.  */
+	  {"verbose", no_argument,       &verbose_flag, 1},
+	  {"brief",   no_argument,       &verbose_flag, 0},
+	  /* These options don't set a flag.
+	     We distinguish them by their indices.  */
+	  {"add",     no_argument,       0, 'a'},
+	  {"append",  no_argument,       0, 'b'},
+	  {"delete",  required_argument, 0, 'd'},
+	  {"create",  required_argument, 0, 'c'},
+	  {"file",    required_argument, 0, 'f'},
+	  {0, 0, 0, 0}
+	};
+      /* @code{getopt_long} stores the option index here.  */
+      int option_index = 0;
+
+      c = getopt_long (argc, argv, "abc:d:f:",
+		       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 'f':
+	  printf ("option -f with value `%s'\n", optarg);
+	  break;
+
+	case '?':
+	  /* @code{getopt_long} already printed an error message.  */
+	  break;
+
+	default:
+	  abort ();
+	}
+    }
+
+  /* Instead of reporting @samp{--verbose}
+     and @samp{--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);
+}