Make the unix-type root directories visible in the Finder
From OS X Scientific Computing
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Problem: /usr /bin /sbin /private are invisible in the Finder
Apple hides the scary directories from its lusers. But there are often times you need to navigate to the /usr directory (or others).
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Solution: Use the chflags command
Example:
sudo chflags nohidden /usr
as a result, the /usr directory instantly appears in the root-level Finder window, save dialog box, etc.
