This is a great little tip for showing hidden files in OSX. Normally all files are hidden, and so access to the hidden unix filesystem is not possible. This is easily overcome however. You can either permanently disable this feature by running the following command in terminal.
defaults write com.apple.Finder AppleShowAllFiles YES
or, if you need to change the visibility on a regular basis the following may be of more help
Open up the apple script editor and paste in the following code
set dotVisible to do shell script "defaults read com.apple.finder AppleShowAllFiles"
on error errorMessage number errorNumber
set dotVisible to 0
if dotVisible = "0" then
do shell script "defaults write com.apple.finder AppleShowAllFiles 1"
do shell script "defaults write com.apple.finder AppleShowAllFiles 0"
tell application "Finder" to quit
tell application "Finder" to activate
Now save this as an application - call it something like 'toggle_hidden_folders'
Clicking on the toggle_hidden_folders.app now toggles the visibility of hidden files and folders.