Sure! Take for example the code in getopt(3) (I'm not posting it here in full because it's longish). Note how you have, essentially, 

       #include <stdio.h>
       #include <getopt.h>

       int
       main (argc, argv)
            int argc;
            char **argv;
       {
           /* ... */
           getopt_long (argc, argv, "abc:d:012", /* short spec */
                        long_options, &option_index);
           /* ... */
       }

[download]

The "argc" and "argv" you're passing the library function getopt_long just happen to be the ones given to you on the command line. But if you'd have constructed any other, er, argument vector, you could have passed that instead.

The same thing happens in Java, when your entry point accepts a String args[], and passes that (or a different String[]) to the options parsing library.

In reply to Re^8: how to deal with 20 commands by gaal
in thread how to deal with 20 commands by bahadur

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