The defaults command in Terminal can modify hidden OS X features.

Commands

Reduce notification banner display time (requires restart)

defaults write com.apple.notificationcenterui bannerTime 1.5

Reference

Save to disk (not to iCloud) by default

defaults write NSGlobalDomain NSDocumentSaveNewDocumentsToCloud -bool false

Remove duplicates in the “Open With” menu (also see lscleanup alias)

/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user

Fix dock stays open after switching spaces

defaults write com.apple.dock autohide-delay -int 0;
defaults write com.apple.dock autohide-time-modifier -float 1.0;
killall Dock

Reference

Disable shadow in screenshots of windows

defaults write com.apple.screencapture disable-shadow -bool true

Stop the Apache server built into macOS

sudo apachectl stop

Reference

Resources

• GitHub: mathiasbynens/dotfiles/.osx