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