text: #include "kernel/types.h"
  #include "kernel/stat.h"
  #include "user/user.h"
  
  int
  main(int argc, char *argv[])
  {
    int i;
  
    if(argc < 2){
      fprintf(2, "Usage: mkdir files...\n");
      exit(1);
    }
  
    for(i = 1; i < argc; i++){
      if(mkdir(argv[i]) < 0){
        fprintf(2, "mkdir: %s failed to create\n", argv[i]);
        break;
      }
    }
  
    exit(0);
  }
  