Toggle OS X El Capitan's menu bar auto-hide state from the command line.
Install with:
brew tap sxmichaels/tap
brew install menubar-toggle
Note that menubar-toggle only works on OS X 10.11 (El Capitan) and
newer, since the auto-hide functionality does not exist on previous
versions of OS X.
The original Objective-C version of menubar-toggle, from which the
current Swift one derives, was based in large part on Sindre Sorhus's
dark-mode.