# Show extensions
Show all file extensions in the Finder.
- Tested on macOS:
- Big Sur
- Catalina
- Mojave
- Parameter type: bool
# Set to false (default value)
Do not show all file extensions inside the Finder
defaults write NSGlobalDomain "AppleShowAllExtensions" -bool "false" && killall Finder
# Set to true
Show all file extensions inside the Finder
defaults write NSGlobalDomain "AppleShowAllExtensions" -bool "true" && killall Finder
# Read current value
defaults read NSGlobalDomain "AppleShowAllExtensions"
# Reset to default value
defaults delete NSGlobalDomain "AppleShowAllExtensions" && killall Finder