Hide Mojave+ Finder's Quick Actions toolbar, which covers up file metadata in columns view.
defaults write com.apple.Finder ShowQuickActionsBar -bool false
Hide Catalina+ green window button popup.
defaults write -g NSZoomButtonShowMenu -bool false
Read serial from filesystem; tested on Yosemite+. Run as root or adjust the path for an external disk [image] as needed.
find /private/var/folders -name consolidated.db -exec sqlite3 -batch {} .dump \;