* dirent_counter 
  recursively count the number of directory entries and report.

* building
  make

* usage
  $ sudo ./dirent_counter /var | sort -nr 
  7300	/var/lib/dpkg/info
  220	/var/cache/apt/archives
  143	/var/lib/dpkg/alternatives
  114	/var/log
  89	/var/games
  ...