Given this getopt-discussion has come up earlier, people might be interested in this. Obviously, it’s a set of macros to handle short-flags which also handles the ‘–’-terminator automatically and sets argv, argc to after the argument list. argv[0] is stored in a global “char *argv0;” which has to be in scope.

An example looks like this (in your main()):

ARGBEGIN {
case 'a':
       /* ARGF() returns the flag-argument, EARGF() calls error-function() if there is no flag-argument */
       argument = EARGF(error-function());
       break;
case 'b':
case 'm':
case 'n':
       /* ARGC() returns the current flag-character */
       char = ARGC();
       break;
default:
       error-function();
} ARGEND