#include <u.h>#include <libc.h> voidusage(void){	fprint(2, "usage: readcons [-s] [-d default] prompt\n");	exits("usage");} voidmain(int argc, char **argv){	char *def, *p;	int secret;		def = nil;	secret = 0;	ARGBEGIN{	case 's':		secret = 1;		break;	case 'd':		def = EARGF(usage());		break;	default:		usage();	}ARGEND		if(argc != 1)		usage(); 	p = readcons(argv[0], def, secret);	if(p == nil)		exits("readcons");	print("%s\n", p);	exits(0);}