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To show hidden files in Finder, enter the following two commands into a Terminal window (press enter after each line):
defaults write com.apple.finder AppleShowAllFiles true
killall Finder​
To hide hidden files in Finder, enter the following two commands into a Terminal window (press enter after each line):
defaults write com.apple.finder AppleShowAllFiles false
killall Finder​
I recommend caution when dealing with system files. If you're not certain what you're doing, it's best to leave them alone.
 
There are some utilities you can use to do this easily as well
OnyX, DesktopUtility and TotalFinder are a few
 
yeah ok i copied a hidden directory from my itunes folder on my windows pc called apdata to my external hard drive. It contains my itunes backups so im trying to open that on my mac now and transfer it to my itunes on my mac
 
I'm not an expert, but I'm gonna guess that has more to do with being incompatible than being hidden
 
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