Show system files in Finder

Default Mac OS X system behavior is to hide system and hidden unix files (usually starting with a . symbol, e.g.: .bash_history will be out of sight). This makes spotting/opening one of this files with Finder extremely difficult.

you may use your terminal, typing command like "ls -a" that will show all of the files in that particular directory, including hidden and system one's. But sometimes it may become annoying to use terminal while using the GUI.

So. To change this default behavior in finder you need to enter those commands in the terminal window:
defaults write com.apple.finder AppleShowAllFiles TRUE
And after this you need to restart all your Finder processes like so:
killall Finder

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