Mac Menu Bar Spacing

Narrow

defaults -currentHost write -globalDomain NSStatusItemSpacing -int 4
defaults -currentHost write -globalDomain NSStatusItemSelectionPadding -int 4

Super Narrow

defaults -currentHost write -globalDomain NSStatusItemSpacing -int 0
defaults -currentHost write -globalDomain NSStatusItemSelectionPadding -int 0

Reset

defaults -currentHost delete -globalDomain NSStatusItemSpacing
defaults -currentHost delete -globalDomain NSStatusItemSelectionPadding