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Display the file extensions in Finder

File extensions (.jpg, .txt, .pdf, etc) are normally hidden by default in OS X. You can either set all extensions to be displayed through the following command:

defaults write NSGlobalDomain AppleShowAllExtensions -bool true

To make the command take effect, you need to restart the Finder.

killall Finder

Revert to the default setting:

defaults write NSGlobalDomain AppleShowAllExtensions -bool false

Restart Finder

killall Finder

Show All Extensions

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