GETOPT(3C)

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GETOPT(3C)

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getopt - ��

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	int getopt (argc, argv, optstring)
	int argc;
	char **argv, *optstring;
	
	extern char *optarg;
	extern int optind, opterr;

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�� getopt �� argv, �� -�� optstring. �� getopt �� [��. intro(1), �� 3 10]. �� , �� getopts(1) �� getopt.

�� optstring �� , �� , �� getopt. �� , �� , �� , �� .

� �� optarg �� .

�� getopt �� optind �� argv, �� . �� optind �� getopt �� 1.

�� (�� , �� ), �� getopt �� -1. �� --, �� . �� , �� -1, � �� -- �� .

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�� getopt �� ?, �� , �� optstring, �� , �� . �� , �� opterr �� 0.

�� �� , �� , �� a � b, � �� o, �� :

     main (argc, argv)
     int argc;
     char **argv;
     {
       int c;
       extern char *optarg;
       extern int optind;
        ...
       while ((c=getopt (argc,argv,"abo:")) != -1)
         switch (c) {
         case 'a':
           if (bflg) 
             errflg++;
           else
             aflg++;
           break;
         case 'b':
           if (aflg) 
             errflg++;
           else
             bproc ();
           break;
         case 'o':
           ofile = optarg;
           break;
         case '?':
           errflg++;
         }
       if (errflg) {
         (void) fprintf (stderr, "usage: ... ");
         exit (2);
       }
       for ( ; optind < argc; optind++) {
         if (access (argv [optind], 4)) {
         ...
     }

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�� getopt �� , �� [��. intro(1)], �� , �� . ��, �� , a � b �� , � �� o �� . �� :

     cmd  -aboxxx file

�� 5: �� .

     cmd  -ab -oxxx file

�� 6: �� , �� , �� .

�� optind �� getopt � �� argv �� .