#include "types.h" #include "stat.h" #include "user.h" int main(int argc, char *argv[]) { if (argc != 3) { printf(2, "Usage: ln old new\n"); exit(); } if (link(argv[1], argv[2]) < 0) { printf(2, "link %s %s: failed\n", argv[1], argv[2]); } exit(); }