ref: c840ce1ccb0106b0d28de985a4de964b88e83d24
dir: /sys/src/cmd/aux/write.c/
#include <u.h>
#include <libc.h>
static char x[1024];
static char s[64] = "  ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
static void
fill(void)
{
	int i;
	for(i = 0; i < sizeof(x); i += sizeof(s)){
		memmove(&x[i], s, sizeof(s));
		x[i] = i>>8;
		x[i+1] = i;
	}
}
void
main(int argc, char *argv[])
{
	int i = 2560;
	if(argc > 1){
		argc--; argv++;
		i = atoi(*argv);
	}
	USED(argc);
	fill();
	while(i--)
		write(1, x, sizeof(x));
	exits(0);
}