Shell script to find size of subdirectories

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http://www.unix.com – Hi I have to find size of subdirectory and automate it in CRON. Eg: parent directory name is NVBKP inside it there are several subdirectories I want to get the size of recent two subdirectories. I have tried ls -ltr diretory path | tail -2 But it is providing only size of the folder not the contents of that folder. For eg if there are 5 subdirectories in NVBKP say a b c d e then i need complete size of d and e. say complete size of d and e is 25 gb but when i am using ls -ltr directory path| tail -2 it is giving me only size of folder d and e i.e 256 mb or something but not its contents (HowTos)