Open Spotlight Search (cmd + space)

Write terminal (hit enter)

Use these commands in terminal to show hidden files:

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defaults write com.apple.finder AppleShowAllFiles yes
killall Finder

(killall Finder relaunches Finder)

(You can also alt + click finder icon and relaunch it there):

Use these commands to hide hidden files:

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defaults write com.apple.finder AppleShowAllFiles no
killall Finder

You can also use third party apps like:

  • Funter: http://nektony.com/products/funter/
  • TinkerTool: http://www.bresink.com/osx/TinkerTool.html