bash scripting challenge -

I have to write a bash script that will repeat the contents of a directory (including the subdirectory) and will substitute the following:

• Replace 'foo' with any file name with 'bar'
• Replace 'foo' in the contents of any file with 'bar'

So far I have found

  find -name '*' -exec {} \]  

: -)

rename E>:

  find -f \ (-exec sed -is / foo / bar / g \ ;, -name \ * foo \ * -exec rename foo bar {} \; \ )