Missing Library folder in Mac OS X Lion

ref:http://www.fixkb.com/2011/08/missing-library-folder-in-mac-os-x-lion.html

Problem
In your home folder, you notice that there is no longer a Library folder.

Cause
This is the default setting by design in Mac OS X Lion.

SolutionTo get your Library folder back:

1. Go to your Applications folder.
2. Go to the Utilities folder.
3. Double click on Terminal.
4. Select all the text in the box below and press cmd + C to Copy.
   chflags nohidden ~/Library
5. In the Terminal window press cmd + V or click Edit > Paste (on the top menu).
6. Press Enter.

To revert back to the default setting change “nohidden” to “hidden” in Step 4.