mirror-displays
A Mac app and command-line tool for fiddling with display mirroring: on/off/toggle
usage: mirror [option] Only the first option passed will be applied
-h Print this usage and exit.
-t Toggle mirroring (default behavior)
-on Turn Mirroring On
-off Turn Mirroring Off
-q Query the Mirroring state and write "on" or "off" to stdout
-l A B Makes display at index B mirror the display at index A
Installing
The mirror command line tool is available via a Homebrew tap:
brew install fcanas/tap/mirror-displays
or
brew tap fcanas/tap
brew install mirror-displays