参考: http://www.cyberciti.biz/faq/copy-folder-linux-command-line/
In this example copy /home/vivek/letters folder and all its files to /usb/backup directory:
cp -avr /home/vivek/letters /usb/backup
-a : Preserve the specified attributes such as directory an file mode, ownership, timestamps, if possible additional attributes: context, links, xattr, all.
-v : Explain what is being done.
-r : Copy directories recursively.
Copy a folder called /tmp/conf to /tmp/backup:
$ cp -avr /tmp/conf/ /tmp/backup