$ defaults write com.apple.dock persistent-apps -array-add '{"tile-type"="small-spacer-tile";}'
$ killall DockSource: macos – Adjust width of spacer between Mac OS dock icons – Ask Different
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How to add a *small* spacer to macOS dock
$ defaults write com.apple.dock persistent-apps -array-add '{"tile-type"="small-spacer-tile";}'
$ killall DockSource: macos – Adjust width of spacer between Mac OS dock icons – Ask Different