I once had a request to sum the number of files in a specific folder.After googling I found the command wc could help me out.
wc – print newline, word, and byte counts for each file. And I think wc is short for Word Count.Please have a detailed information by visiting http://linux.about.com/library/cmd/blcmdl1_wc.htm if you have the desire.
Ok,Let’ get the total number of files(including folders) in a specific folder

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20:56:08-androidyue/tmp$ ls | wc

Well,the following command will sum the number of pure files(Not including folders)

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20:58:27-androidyue/tmp$ ll | grep ^- | wc

However how to sum the number of pure folder?The following command will help.

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21:00:20-androidyue/tmp$ ll | grep ^d | wc