Show File Extensions

In OS X, we don’t see file extensions by default. However, in a number of environments it’s very useful to have them. To see them in the Finder, send a boolean AppleShowAllExtensions key to the NSGlobalDomain as True, then restart the Finder.

defaults write NSGlobalDomain AppleShowAllExtensions -bool true; killall Finder

To change back to not seeing extensions:

defaults write NSGlobalDomain AppleShowAllExtensions -bool false; killall Finder

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