How to move all files plus hidden to folder down?

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http://unix.stackexchange.com – I want to move all my drupal files in www folder to html folder. I don't know how to do this in terminal and I'm not sure if all folder and files including hidden ones are drupal in the www folder, is there a way of checking the lesser obvious ones or would www have been empty before and any hidden files will auto recreate? (HowTos)