text: // init: The initial user-level program
  
  #include "types.h"
  #include "stat.h"
  #include "user.h"
  #include "fcntl.h"
  
  char *argv[] = {"sh", 0};
  
  int main(void)
  {
    int pid, wpid;
  
    if (open("console", O_RDWR) < 0)
    {
      mknod("console", 1, 1);
      open("console", O_RDWR);
    }
    dup(0); // stdout
    dup(0); // stderr
    for (;;)
    {
      printf(1, "init: starting sh\nHamed,Mehrab,Ali\n");
      pid = fork();
      if (pid < 0)
      {
        printf(1, "init: fork failed\n");
        exit();
      }
      if (pid == 0)
      {
        exec("sh", argv);
        printf(1, "init: exec sh failed\n");
        exit();
      }
      while ((wpid = wait()) >= 0 && wpid != pid)
        printf(1, "zombie!\n");
    }
  }
  