c language getopt usage — Jun 10, 2010

The main() function’s double life :::

• int main (int argc, char *argv[]);
• int main (int argc, char **argv);

The global variables set by getopt() include:

1. optarg ::: A pointer to the current option argument, if there is one
2. optind ::: An index of the next argv pointer to process when getopt() is called again
3. optopt ::: This is the last known option

If you don’t want getopt to print error message, you can set opterr to zero

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