coreutils

// yes.c, version 1.0.1
// OMKOV coreutils implementation of yes
// Copyright (C) 2020, Jakob Wakeling
// MIT Licence

#include <stdio.h>

int main(int ac, char *av[]) {
	if (ac == 1) for (;;) { puts("y"); }
	else for (;;) { puts(av[1]); }
}