#include <unistd.h> #include <stdio.h>

int main (int argc, char **argv) { int aflag = 0; int bflag = 0; char *cvalue = NULL; int index; int c;

opterr = 0;

while ((c = getopt (argc, argv, "abc:")) != -1) switch (c) { case ’a’: aflag = 1; break; case ’b’: bflag = 1; break; case ’c’: cvalue = optarg; break; case ’?’: if (isprint (optopt)) fprintf (stderr, "Unknown option ‘-%c’.\n", optopt); else fprintf (stderr, "Unknown option character ‘\\x%x’.\n", optopt); return 1; default: abort (); }

printf ("aflag = %d, bflag = %d, cvalue = %s\n", aflag, bflag, cvalue);

for (index = optind; index < argc; index++) printf ("Non-option argument %s\n", argv[index]); return 0; }

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