// 
// make lots of directories.
// ./a <#of-dirs>
// ./a with no arguments to delete dirs.
main(int argc,char *argv[])
{
 int c=0,d=0;
 if (argc!=2) 
 {
  while(!chdir("./A"))c++;
  chdir("..");
  printf("c=%d  removing\n",c);
  while(!rmdir("./A")) {chdir("..");c--;}
  if(c)printf("erm. bad thing.\n");
 }
 else
 {
  c=atoi(argv[1]);
  printf("c=%d  making.\n",c);
  while(c--)
  {
   mkdir("./A",0777);
   chdir("./A");
  } 
 }
}